Update README.md with LinkedIn page (#4508)

Author: gagb

README.md

@@ -3,7 +3,8 @@
 <div align="center">
 <img src="https://microsoft.github.io/autogen/0.2/img/ag.svg" alt="AutoGen Logo" width="100">
 
-[![Twitter](https://img.shields.io/twitter/url/https/twitter.com/cloudposse.svg?style=social&label=Follow%20%40pyautogen)](https://twitter.com/pyautogen) [![GitHub Discussions](https://img.shields.io/badge/Discussions-Q%26A-green?logo=github)](https://github.com/microsoft/autogen/discussions) [![0.2 Docs](https://img.shields.io/badge/Docs-0.2-blue)](https://microsoft.github.io/autogen/0.2/) [![0.4 Docs](https://img.shields.io/badge/Docs-0.4-blue)](https://microsoft.github.io/autogen/dev/)
+[![Twitter](https://img.shields.io/twitter/url/https/twitter.com/cloudposse.svg?style=social&label=Follow%20%40pyautogen)](https://twitter.com/pyautogen) [![LinkedIn](https://img.shields.io/badge/LinkedIn-Company?style=flat&logo=linkedin&logoColor=white)](https://www.linkedin.com/company/105812540)
+[![GitHub Discussions](https://img.shields.io/badge/Discussions-Q%26A-green?logo=github)](https://github.com/microsoft/autogen/discussions) [![0.2 Docs](https://img.shields.io/badge/Docs-0.2-blue)](https://microsoft.github.io/autogen/0.2/) [![0.4 Docs](https://img.shields.io/badge/Docs-0.4-blue)](https://microsoft.github.io/autogen/dev/)
 [![PyPi autogen-core](https://img.shields.io/badge/PyPi-autogen--core-blue?logo=pypi)](https://pypi.org/project/autogen-core/0.4.0.dev8/) [![PyPi autogen-agentchat](https://img.shields.io/badge/PyPi-autogen--agentchat-blue?logo=pypi)](https://pypi.org/project/autogen-agentchat/0.4.0.dev8/) [![PyPi autogen-ext](https://img.shields.io/badge/PyPi-autogen--ext-blue?logo=pypi)](https://pypi.org/project/autogen-ext/0.4.0.dev8/)
 
 </div>