Add "Contributing" section

README.md

@@ -1,19 +1,6 @@
-# overworld ![Build status badge](https://github.com/riknoll/overworld/workflows/MakeCode/badge.svg)
+# Tilemaps ![Build status badge](https://github.com/riknoll/overworld/workflows/MakeCode/badge.svg)
 
-This extension contains advanced APIs for working with tilemaps in blocks. The APIS are
-divided into two categories:
-
-1. **Tilemap** - Blocks that can be used with any tilemap in Microsoft MakeCode Arcade
-1. **Overworld** - Blocks that can be used to create multiple tilemaps and transition between them
-
-Overworld is great for creating worlds in MakeCode Arcade composed of multiple
-tilemaps. Here are some good use cases:
-
-1. Games with multiple levels
-1. Games with multiple settings linked by doorways
-1. Games with locations connected by an overworld
-1. Top-down games where the player moves between multiple connected "screens"
-1. Procedurally generated tilemap games
+This extension contains advanced APIs for working with tilemaps in blocks.
 
 ## Create a project with this extension
 
@@ -37,3 +24,16 @@ To edit this repository in Microsoft MakeCode.
 * for PXT/arcade
 (The metadata above is needed for package search.)
 
+# Contributing
+
+This project welcomes contributions and suggestions.  Most contributions require you to agree to a
+Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us
+the rights to use your contribution. For details, visit https://cla.opensource.microsoft.com.
+
+When you submit a pull request, a CLA bot will automatically determine whether you need to provide
+a CLA and decorate the PR appropriately (e.g., status check, comment). Simply follow the instructions
+provided by the bot. You will only need to do this once across all repos using our CLA.
+
+This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/).
+For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or
+contact [opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional questions or comments.