Update CONTRIBUTING.md (#69)

Add important header about discussing significant contributions with existing assignee of the issue first before starting to do work

CONTRIBUTING.md

@@ -1,7 +1,9 @@
 # Contributing to Azure MCP
 
 There are many ways to contribute to the Azure MCP project: reporting bugs, submitting pull requests, and creating suggestions.
-After cloning and building the repo, check out the [issues list](https://github.com/Azure/azure-mcp/issues).  Issues labeled [help wanted](https://github.com/Azure/azure-mcp/labels/help%20wanted) are good issues to submit a PR for.  Issues labeled [good first issue](https://github.com/Azure/azure-mcp/labels/good%20first%20issue) are great candidates to pick up if you are in the code for the first time.  If you are contributing significant changes, or if the issue is already assigned to a specific milestone, please discuss with the assignee of the issue first before starting to work on the issue.
+After cloning and building the repo, check out the [github project](https://github.com/orgs/Azure/projects/812/views/13) and [issues list](https://github.com/Azure/azure-mcp/issues).  Issues labeled [help wanted](https://github.com/Azure/azure-mcp/labels/help%20wanted) are good issues to submit a PR for.  Issues labeled [good first issue](https://github.com/Azure/azure-mcp/labels/good%20first%20issue) are great candidates to pick up if you are in the code for the first time.  
+>[!IMPORTANT]
+If you are contributing significant changes, or if the issue is already assigned to a specific milestone, please discuss with the assignee of the issue first before starting to work on the issue.
 
 ## Prerequisites