Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+Thanks for being interested! Here's guidelines to contributing to package.
+
+## Get Set Up
+- Check the issues to see if your problem has already been brought up.
+- Submit a ticket if it hasn't. Be sure to be clear and give instructions on how to reproduce the issue you're having.
+
+## Getting Your Hands Dirty
+- Fork the repository.
+- Create new branch from **master** or any branch on your fork (feel free to use any flow on your fork).
+- Put your pull requests to [master](https://github.com/num8er/TranzWarePaymentGatewayApi/tree/master) branch.
+
+## Submit!
+- Push your changes.
+- Submit a pull request.
+- We (contributors) will review your changes and try to respond in a timely manner.
+
+That's it!
+Happy contributing!