Create CONTRIBUTING.md

Author: FagnerMartinsBrack

CONTRIBUTING.md

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+## Issues
+
+- Report issues or feature requests on [GitHub Issues](https://github.com/js-cookie/java-cookie/issues).
+- If reporting a bug, please add a [simplified example](http://sscce.org/).
+
+## Pull requests
+- Create a new topic branch for every separate change you make.
+- Create a test case if you are fixing a bug or implementing an important feature.
+- Make sure the build runs successfully [(see below)](#development).
+
+## Development
+
+// TODO