Create CONTRIBUTING.md

Author: willscott

CONTRIBUTING.md

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+# Contributing Guidelines
+
+We appreciate your interest in improving go-nfs!
+
+## Looking for ways to contribute?
+
+There are several ways you can contribute:
+- Start contributing immediately via the [opened](https://github.com/willscott/go-nfs/issues) issues on GitHub.
+  Defined issues provide an excellent starting point.
+- Reporting issues, bugs, mistakes, or inconsistencies.
+  As many open source projects, we are short-staffed, we thus kindly ask you to be open to contribute a fix for discovered issues.