Added details for contributions

CONTRIBUTING.md

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+# Contributing
+
+Fork and create a new branch. *It is best to leave `master` for keeping your fork up to date.*
+- Try to keep the code style consistent.
+- Test your changes with the demo app.
+- Push your code and open a Pull Request!
+
+# Bugs
+
+Please be clear and as detailed as possible in your description of the bug.
+- version you are using. *just post your Podfile.lock if unsure*.
+- Steps to reproduce.
+- <3 a demo app on git or zip.
+