Add pr template

Author: dbjorge

.github/pull_request_template.md

@@ -0,0 +1,12 @@
+<!--
+Thanks for contributing to Jorbs's Wanderer Trilogy!
+
+Before sending your PR, we recommend:
+
+* For large or complicated changes, discuss it first at https://discord.gg/jorbs
+* Reference any related issues (eg, "fixes #123") in your PR description
+* If the change is user-facing, include bullet point(s) in CHANGELOG.md's [Unreleased] section describing the change for players
+* If you are a new contributor, welcome! Feel free to add your name to /docs/credits.md in whichever format you'd like to appear!
+
+See CONTRIBUTING.md for more information and guidance, or come ask questions at https://discord.gg/jorbs
+-->