ADD: contributing notice

Author: sshaplygin

CONTRIBUTING.md

@@ -0,0 +1,16 @@
+# Contributing
+
+When contributing to this repository, please first discuss the change you wish to make via issue,
+email, or any other method with the owners of this repository before making a change. 
+
+Please note we have a code of conduct, please follow it in all your interactions with the project.
+
+## Pull Request Process
+
+1. Fork it
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Commit your changes (`git commit -am 'Add some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create new Pull Request
+
+Please make an issue first if the change is likely to increase.

README.md

@@ -136,6 +136,11 @@ so.Emit("some:event", dataForClient, func (so socketio.Socket, data string) {
 })
 ```
 
+## Contributors
+
+This project exists thanks to all the people who contribute. [[Contribute](CONTRIBUTING.md)].
+<a href="https://github.com/googollee/go-socket.io/graphs/contributors">
+
 ## License
 
 The 3-clause BSD License  - see LICENSE for more details