Added a contributing.md

CONTRIBUTING.md

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+# Contributing
+We are open to, and grateful for, any contributions made by the community.
+
+## Reporting Issues and Asking Questions
+Before opening an issue, please search the [issue tracker](https://github.com/taylorhakes/fecha/issues) to make sure your issue hasn't already been reported.
+
+## Development
+
+Visit the [Issue tracker](https://github.com/taylorhakes/fecha/issues) to find a list of open issues that need attention.
+
+Fork, then clone the repo:
+```
+git clone https://github.com/your-username/fecha.git
+```
+
+### New Features
+
+Please open an issue with a proposal for a new feature or refactoring before starting on the work. We don't want you to waste your efforts on a pull request that we won't want to accept.
+
+## Submitting Changes
+
+* Open a new issue in the [Issue tracker](https://github.com/taylorhakes/fecha/issues).
+* Fork the repo.
+* Create a new feature branch based off the `master` branch.
+* Make sure all tests pass and there are no linting errors.
+* Submit a pull request, referencing any issues it addresses.
+
+Please try to keep your pull request focused in scope and avoid including unrelated commits.