Add CONTRIBUTING.md so there's a banner on the PR.

It just points to https://periph.io/project/contributing/
9 years ago · d7c75db11b
parent c15fd0bfa5
commit d7c75db11b
1 changed files with 4 additions and 0 deletions
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@ -0,0 +1,4 @@
+# Contributing
+
+Thanks for contributing to the project! Please look at [periph the
+contribution guidelines](https://periph.io/project/contributing/) first.