Create CONTRIBUTING.md

CONTRIBUTING.md

@@ -0,0 +1,15 @@
+# Contributing
+
+Your contributions are always welcome!
+
+## Guidelines
+
+* Add section if needed.
+    * Add section description.
+    * Add section title to Table of contents.
+* Search previous suggestions before making a new one, as yours may be a duplicate.
+* Add your links: `* [project-name](http://example.com/) - A short description ends with a dot.`
+* Don't mention `Arduino` in the description as it's implied.
+* Check your spelling and grammar.
+* Make sure your text editor is set to remove trailing whitespace.
+* Send a Pull Request.