Update root README.md (#7028)

Updating Contributing section according to the guidelines and the SO tags

README.md

@@ -42,11 +42,18 @@ Libraries which enable you to provision specific server resources. They are dire
 * For reference documentation visit the [Azure SDK for .NET API Reference](http://aka.ms/net-docs).
 * For tutorials, samples, quick starts, and other documentation, go to [Azure for .NET Developers](https://docs.microsoft.com/en-us/dotnet/azure/).
 * File an issue via [Github Issues](https://github.com/Azure/azure-sdk-for-net/issues/new/choose).
-* Check [previous questions](https://stackoverflow.com/questions/tagged/azure-net-sdk) or ask new ones on StackOverflow using `azure-net-sdk` tag.
+* Check [previous questions](https://stackoverflow.com/questions/tagged/azure+.net) or ask new ones on StackOverflow using `azure` and `.net` tags.
 
 ## Contributing
 For details on contributing to this repository, see the [contributing guide](CONTRIBUTING.md).
 
+This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit
+https://cla.microsoft.com.
+
+When you submit a pull request, a CLA-bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., label, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repositories using our CLA.
+
+This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/). For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact [[email protected]](mailto:[email protected]) with any additional questions or comments.
+
 | Component | Build Status |
 | --------- | ------------ |
 | Client Libraries | [![Build Status](https://dev.azure.com/azure-sdk/public/_apis/build/status/290?branchName=master)](https://dev.azure.com/azure-sdk/public/_build/latest?definitionId=290&branchName=master) [![Dependencies](https://img.shields.io/badge/dependencies-analyzed-blue.svg)](https://azuresdkartifacts.blob.core.windows.net/azure-sdk-for-net/dependencies/dependencies.html) |