Adding contributing (#41)

CONTRIBUTING.md

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+# Contributing
+
+Microsoft Azure Service Fabric and Service Fabric CLI welcome any kind of contribution, whether it be reporting issues or sending pull requests.
+When contributing to this repository abide by the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/).
+
+## Code changes
+
+Follow the [wiki page on contributing](https://github.com/Azure/service-fabric-cli/wiki/Contributing) to submit code changes.
+
+## Issues and questions
+
+For questions related to Azure Service Fabric clusters, take a look at the [tag on StackOverflow](https://stackoverflow.com/questions/tagged/azure-service-fabric)
+and [official documentation](https://docs.microsoft.com/en-us/azure/service-fabric/).
+
+### General Service Fabric issues
+
+If your issue is not specific to the Service Fabric CLI, please use the [Service Fabric issues repository](https://github.com/Azure/service-fabric-issues/issues) to report an issue.
+
+### CLI specific issues
+
+If your issue is relevant to the Service Fabric CLI, please use this repositories issue tracker.
+
+Be sure to search for similar previously reported issues prior to creating a new one.
+In addition, here are some good practices to follow when reporting issues:
+
+- Add a `+1` reaction to existing issues that are affecting you
+- Include verbose output (`--debug` flag) when reporting unexpected error messages
+- Include the version of sfctl installed, `pip show sfctl` will report this
+- Include the version of Service Fabric runtime for the cluster you have selected