Suggestions

CONTRIBUTING.md

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+# Contributing to resync
+
+Issues and pull requests are appreciated.
+
+## Submitting issues
+
+In the case of bugs please describe in detail, preferably with a recipe to repeat and demonstrate the problem. Although you should include test data as necessary, please be careful not to include secrets or passwords!
+
+If you suggest a new feature, please give an example of expected behavior and use. For changes to modules and methods a tests case would be idea.
+
+## Coding style
+
+If submitting a pull request:
+
+   * Please discuss in a issue before submitting a pull request for significant changes.
+   * Please follow [PEP8](https://www.python.org/dev/peps/pep-0008/) and [PEP257](https://www.python.org/dev/peps/pep-0257/) style rules.
+   * Please don't repeat code.
+   * Please cover the code with tests.
+