Created contributing

CONTRIBUTING.md

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+# Reporting issues
+
+Found a bug in the library? Don't hesitate to open an issue! But first:
+
+* Check if it hasn't been reported yet.
+* Verify the bug still exists in the `dev` branch.
+
+When describing an issue, be precise:
+
+* Include steps to reproduce (including sample code if necessary);
+* What happened? What do you think should have happened?
+* On what Android version does this issue occur?
+
+# Contributing code
+
+## Please do!
+
+I'm happy to view and accept pull requests. However, it is important to follow these guidelines if you want to contribute.
+
+## General steps
+
+* [Fork](https://github.com/nhaarman/ListViewAnimations/fork) the repository.
+* Create a local clone of the repository.
+* Create a local branch, **based on the `dev` branch** (see the *Rules* section)
+* Commit your code, and push the changes to your own repository.
+* Create a pull request, specifying that you want to merge into the `dev` branch (or any child branch of it)
+
+## Rules
+
+* Branch names should start with either `feature_` or `bugfix_`. If there is an open issue, include its number, like `bugfix_123`.
+* **Do not** include in your commit message anything related to automatic issue closing, such as `Fixes issue 123`. We'll do that when merging your pull request.
+* **Do not** put any `@author` comment. Git keeps track of all your changes and `@author` does more harm than good.
+* **Do not** issue a pull request into the `master` branch.
+* Try to keep the diff as small as possible. For example, be aware of auto formatting.
+* All files should have the Apache 2 License header.