Adds contribution rules to the main readme.txt (#682)

I'm making rules and they will be followed when this is merged.

## Contribution Rules and Guidelines

**1. Do Not Be A Dick**
- The Bubberstation main repository is run by and contributed by
volunteers. You are not entitled to our time and energy. We reserve the
right to permanently remove anyone who does not show both our
contributor's and maintainer's common decency.

**2. This repository will only accept feedback that has to do with the
functionality of code, sound, and images**
- To maintain a proper working space for our contributors and to keep
the repository free of clutter. All feedback that does not have to do
with the functionality, quality, and review of code will be marked
off-topic.
- If you feel like feedback on a controversial PR is required, you are
free to open a [feature
request](.https://github.com/Bubberstation/Bubberstation/issues/new/choose)
under the repository issues page and reference the PR number.

**3. The Licensing is Non-negotiable**
- You are free to take, redistribute, modify, and readapt any code or
commit found on this repository.
- All code files are under **GNU AGPL V3** 
- All asset files (images and sound) are **CC-BY-SA 3.0** unless
otherwise stated
- The license information, including the MIT license and its exceptions,
can be found at the bottom of this readme.
- What does this mean to our contributors? **The** [GNU AGPL
V3](.https://www.gnu.org/licenses/agpl-3.0.html) **licensing on this
codebase is non-negotiable** and **irrevocable** the moment you open a
PR. We are incapable of privatizing this codebase and you are incapable
of restricting your code contributions even if you close the PR. Do not
open a contribution if you do not feel comfortable with your code being
permanent across the entirety of the community. **All contributions are
preserved in commit history**
- What does this mean to our spriters and sound designers? [CC-BY-SA
3.0](.https://creativecommons.org/licenses/by-sa/3.0/) **is the only
license that this project will accept** unless given express permission
by the owners of this repository.
- It is prohibited to use the attribution requirement to [suggest that
you endorse or support a particular
use](.https://creativecommons.org/faq/#do-i-need-to-be-aware-of-anything-else-when-providing-attribution)
of your assets.
- You are entitled to credit yourself with comments and you are entitled
to waive the attribution requirement choosing not to be identified as
the creator if you wish.
- If you do not like how your assets were modified or used, it is
required that the other person [remove the attribution information upon
request](.https://wiki.creativecommons.org/wiki/License_Versions#Licensors_may_request_removal_of_attribution).
- Modifications or adaptions must disclose the source, the author, and
[any changes you've
made](.https://wiki.creativecommons.org/wiki/License_Versions#Modifications_and_adaptations_must_be_indicated).
- The goon code is incompatible with this codebase and will not be
accepted.

.github/PULL_REQUEST_TEMPLATE.md

@@ -34,3 +34,5 @@ server: something server ops should know
 
 <!-- Both :cl:'s are required for the changelog to work! You can put your name to the right of the first :cl: if you want to overwrite your GitHub username as author ingame. -->
 <!-- You can use multiple of the same prefix (they're only used for the icon ingame) and delete the unneeded ones. Despite some of the tags, changelogs should generally represent how a player might be affected by the changes rather than a summary of the PR's contents. -->
+
+<!-- By opening a pull request. You have read and understood the repository rules located on the main README.md on this project. -->

README.md

@@ -21,6 +21,30 @@ This is Bubberstation's downstream fork of Skyrat, which is in turn a fork of tg
 
 Space Station 13 is a paranoia-laden round-based roleplaying game set against the backdrop of a nonsensical, metal death trap masquerading as a space station, with charming spritework designed to represent the sci-fi setting and its dangerous undertones. Have fun, and survive!
 
+## Contribution Rules and Guidelines
+
+**1. Do Not Be A Dick**
+- The Bubberstation main repository is run by and contributed by volunteers. You are not entitled to our time and energy. We reserve the right to permanently remove anyone who does not show both our contributor's and maintainer's common decency.
+
+**2. This repository will only accept feedback that has to do with the functionality of code, sound, and images**
+- To maintain a proper working space for our contributors and to keep the repository free of clutter. All feedback that does not have to do with the functionality, quality, and review of code will be marked off-topic.
+- If you feel like feedback on a controversial PR is required, you are free to open a [feature request](.https://github.com/Bubberstation/Bubberstation/issues/new/choose) under the repository issues page and reference the PR number.
+
+**3. The Licensing is Non-negotiable**
+- You are free to take, redistribute, modify, and readapt any code or commit found on this repository. 
+- All code files are under **GNU AGPL V3** 
+- All asset files (images and sound) are **CC-BY-SA 3.0** unless otherwise stated
+- The license information, including the MIT license and its exceptions, can be found at the bottom of this readme. 
+- What does this mean to our contributors? **The** [GNU AGPL V3](.https://www.gnu.org/licenses/agpl-3.0.html) **licensing on this codebase is non-negotiable** and **irrevocable** the moment you open a PR. We are incapable of privatizing this codebase and you are incapable of restricting your code contributions even if you close the PR. Do not open a contribution if you do not feel comfortable with your code being permanent across the entirety of the community. **All contributions are preserved in commit history**
+- What does this mean to our spriters and sound designers? [CC-BY-SA 3.0](.https://creativecommons.org/licenses/by-sa/3.0/) **is the only license that this project will accept**
+- It is prohibited to use the attribution requirement to [suggest that you endorse or support a particular use](.https://creativecommons.org/faq/#do-i-need-to-be-aware-of-anything-else-when-providing-attribution) of your assets.
+- You are entitled to credit yourself with comments and you are entitled to waive the attribution requirement choosing not to be identified as the creator if you wish.
+- If you do not like how your assets were modified or used, it is required that the other person [remove the attribution information upon request](.https://wiki.creativecommons.org/wiki/License_Versions#Licensors_may_request_removal_of_attribution).
+- Modifications or adaptions must disclose the source, the author, and [any changes you've made](.https://wiki.creativecommons.org/wiki/License_Versions#Modifications_and_adaptations_must_be_indicated). 
+- Goonstation code is incompatible with this codebase and will not be accepted.
+
+*Credit: [Goonstation contribution guidelines](.https://hackmd.io/@goonstation/docs/%2F%40goonstation%2Fcontribute#What-if-I-change-my-mind-about-my-contributions-being-published)*
+
 ## Important note - TEST YOUR PULL REQUESTS
 
 You are responsible for the testing of your content. You should not mark a pull request ready for review until you have actually tested it. If you require a separate client for testing, you can use a guest account by logging out of BYOND and connecting to your test server.
@@ -44,7 +68,7 @@ Find `BUILD.bat` here in the root folder of tgstation, and double click it to in
 
 **[How to compile in VSCode and other build options](tools/build/README.md).**
 
-## Contributors
+## TG Guide Contributors
 [Guides for Contributors](.github/CONTRIBUTING.md)
 
 ## LICENSE