add contributing guide
add contributing guide

file:b/CONTRIBUTING.md (new)
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -1,1 +1,3 @@
+## Contributing
+Changes and improvements are more than welcome! Feel free to fork and open a pull request. Please make your changes in a specifically made branch and request to pull on `master`! If you can, please make sure the game fully works before sending the PR, as that will help speed up the process.
 

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