Create CONTRIBUTING.md

Author: ZigRazor

CONTRIBUTING.md

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+# How to contribute [![GitHub contributors](https://img.shields.io/github/contributors/ZigRazor/PyStateMachine.svg)](https://GitHub.com/ZigRazor/PyStateMachine/graphs/contributors/)
+If you want give your support you can create a ***pull request***   [![GitHub pull-requests](https://img.shields.io/github/issues-pr/ZigRazor/PyStateMachine.svg)](https://GitHub.com/ZigRazor/PyStateMachine/pull/) or report an ***issue***  [![GitHub issues](https://img.shields.io/github/issues/ZigRazor/PyStateMachine.svg)](https://GitHub.com/ZigRazor/PyStateMachine/issues/).
+
+If you are interested in develop with us, you can contact us at zigrazor@gmail.com .