Add preamble

Signed-off-by: Jesse Whitehouse <[email protected]>

Author: susodapop

CONTRIBUTING.md

@@ -1,6 +1,8 @@
-# Contributing
+We happily welcome contributions to the `databricks-sql-connector` package. We use [GitHub Issues](https://githaub.com/databricks/databricks-sql-python/issues) to track community reported issues and [GitHub Pull Requests](https://githaub.com/databricks/databricks-sql-python/pulls) for accepting changes.
 
-To contribute to this repository, fork it and send pull requests.
+Contributions are licensed on a license-in/license-out basis.
+
+# Contributing Guide
 
 ## Set up your environment