Add a contributing md

CONTRIBUTING.md

@@ -0,0 +1,40 @@
+# Contributing to gocron
+
+Thank you for coming to contribute to gocron! We welcome new ideas, PRs and general feedback.
+
+## Reporting Bugs
+
+If you find a bug then please let the project know by opening an issue after doing the following:
+
+- Do a quick search of the existing issues to make sure the bug isn't already reported
+- Try and make a minimal list of steps that can reliably reproduce the bug you are experiencing
+- Collect as much information as you can to help identify what the issue is (project version, configuration files, etc)
+
+## Suggesting Enhancements
+
+If you have a use case that you don't see a way to support yet, we would welcome the feedback in an issue. Before opening the issue, please consider:
+
+- Is this a common use case?
+- Is it simple to understand?
+
+You can help us out by doing the following before raising a new issue:
+
+- Check that the feature hasn't been requested already by searching existing issues
+- Try and reduce your enhancement into a single, concise and deliverable request, rather than a general idea
+- Explain your own use cases as the basis of the request
+
+## Adding Features
+
+Pull requests are always welcome. However, before going through the trouble of implementing a change it's worth creating a bug or feature request issue. 
+This allows us to discuss the changes and make sure they are a good fit for the project.
+
+Please always make sure a pull request has been:
+
+- Unit tested with `make test`
+- Linted with `make lint`
+- Vetted with `make vet`
+- Formatted with `make fmt` or validated with `make check-fmt`
+
+## Writing Tests
+
+Tests should follow the [table driven test pattern](https://dave.cheney.net/2013/06/09/writing-table-driven-tests-in-go). See other tests in the code base for additional examples.