Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+We welcome pull requests from everyone. By participating in this project, you agree to abide by the
+[code of conduct](CODE_OF_CONDUCT.md).
+
+## Forking the Code
+
+Here's a [blog post](http://blog.campoy.cat/2014/03/github-and-go-forking-pull-requests-and.html) on how to fork a go
+project.
+
+Building tstask in go (assuming you're up and running with a go already) is as simple as:
+
+```
+go get github.com/trafero/tstack/cmd/...
+```
+
+## What to Do Before Making a Pull Request
+
+* Please use "go fmt" to format your code
+* Please check that the [Paho functional tests](https://github.com/trafero/tstack/blob/master/docs/performance.md#functional-testing)
+pass before submitting a pull request
+
+## What Happens After You Create a Pull Request?
+
+At this point you're waiting on us. We like to at least comment on pull requests within three business days. 
+We may suggest some changes or improvements or alternatives. One thing is for sure - we'll be delighted that you have
+taken the time to support the project.
+
+Some things that will increase the chance that your pull request is accepted:
+
+* Write tests
+* Comment your code
+* Write a good commit message