doc: Add Pankaj to our README (#7266)

We have a new team member!

README.md

@@ -163,6 +163,7 @@ If you would like to ask a question that you feel doesn't warrant an issue (yet)
 * Mike Griese, Developer: [@zadjii](https://twitter.com/zadjii)
 * Carlos Zamora, Developer: [@cazamor_msft](https://twitter.com/cazamor_msft)
 * Leon Liang, Developer: [@leonmsft](https://twitter.com/leonmsft)
+* Pankaj Bhojwani, Developer
 
 ## Developer Guidance