Create CONTRIBUTING.md

CONTRIBUTING.md

@@ -0,0 +1,26 @@
+# Contributing guidelines
+
+You are welcome to contribute to Egui via discussions, issues, pull requests and by publishing Egui integrations.
+
+## Discussion
+
+You can ask questions, share screenshots and more at GitHub Discussions: https://github.com/emilk/egui/discussions
+
+There is also an Egui channel on the Embark discord at <https://discord.gg/vY8ZGS292W> (NOTE: I work at [Embark](https://www.embark-studios.com/), but Egui is my hobby project).
+
+## Filing an issue
+
+Issues are for bug reports and feature requests. Issues are not for asking questions (use [Discussions](https://github.com/emilk/egui/discussions) for that).
+
+Always make sure there is not already a similar issue to the one you are creating.
+
+If you are filing a bug, please provide a way to reproduce it.
+
+## Making a PR
+
+Always file an issue (or find an existing one) and get feedback before you start working on a non-trivial pull request!
+
+## Creating an integration for Egui
+
+If you make an integration for Egui for some engine or renderer, please share it with the world!
+I will add a link to it from the Egui README.md so others can easily find it.