Away Mission guidelines (#14871)

_maps/RandomZLevels/GUIDELINES.md

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+# Away Mission Creation Guidelines
+So, you want to make an away mission! They're a lot of fun to play, but they're a challenge to create.
+To ensure a consistent standard of quality across away missions, following the guidelines (split into recommended and required)
+is beneficial to ensure your PR is merged.
+
+## Recommendations
+ * Create a design document
+   * This one is good because it lets you make a coherent thought of what you want your away mission to be, and for others to understand its purpose.
+ * Don't go alone
+   * Away missions are hard work! Making a team of different specializations helps out massively with workload and speed of the project.
+ * Communicate with Maintainers
+   * During the creation of your away mission, it is highly recommended you communicate with maintainers to ensure major changes do not have to be made when it's finished.
+
+## Design Requirements
+ * Minimum average time to complete: 60 minutes
+   * Bare minimum, it should take a team of 4-6 60 minutes to complete.
+ * Design around 4-6 players
+   * Skyrat's gateways use the Vanguard expedition team, which is usually 4 players, but it's best to account for up to 6.
+ * Not purely PvE
+   * Design your gateway with more than just regular simplemobs in mind. Add puzzles, story, PVP, boss fights, etc. to spice up the gameplay instead of a slog of simplemobs.
+ * Loot should not be extreme
+   * The gateway's loot should mostly be given in the purview of using it in the gateway itself (final boss loot and similar not withstanding).
+   * Loot that's unusable outside the gateway is given more leeway.
+   * Loot should not be the primary encouragement for someone to go through the gateway.