Adds a PR template

.github/PULL_REQUEST_TEMPLATE.md

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+**What does this PR tweak:**
+Include a small description of what your PR changes
+
+**Why is this better:**
+This is your reasoning for why the PR should be merged
+
+**Images of sprite/map changes (IF APPLICABLE):**
+If you did not make a map or sprite edit, you may leave this section blank. You may include a gif of your feature if you want
+
+**Changelog:**
+*Remove this line, and appropriate fields from the changelog*
+:cl: name here
+add: Added new things
+del: Removed old things
+tweak: tweaked a few things
+balance: rebalanced something
+fix: fixed a few things
+wip: added a few works in progress
+soundadd: added a new sound thingy
+sounddel: removed an old sound thingy
+imageadd: added some icons and images
+imagedel: deleted some icons and images
+spellcheck: fixed a few typos
+experiment: added an experimental thingy
+/:cl:
+