Add download badges to README (#156)

* Initial plan

* Add download badges to README with package repository links

Co-authored-by: friggeri <106686+friggeri@users.noreply.github.com>

* Update README.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: friggeri <106686+friggeri@users.noreply.github.com>
Co-authored-by: Adrien Friggeri <adrien@friggeri.net>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: 3 people

README.md

@@ -2,6 +2,10 @@
 
 ![GitHub Copilot SDK](./assets/RepoHeader_01.png)
 
+[![NPM Downloads](https://img.shields.io/npm/dm/%40github%2Fcopilot-sdk?label=npm)](https://www.npmjs.com/package/@github/copilot-sdk)
+[![PyPI - Downloads](https://img.shields.io/pypi/dm/github-copilot-sdk?label=PyPI)](https://pypi.org/project/github-copilot-sdk/)
+[![NuGet Downloads](https://img.shields.io/nuget/dt/GitHub.Copilot.SDK?label=NuGet)](https://www.nuget.org/packages/GitHub.Copilot.SDK)
+
 Agents for every app.
 
 Embed Copilot's agentic workflows in your application—now available in Technical preview as a programmable SDK for Python, TypeScript, Go, and .NET.