add contribution and collaboration in readme

CONTRIBUTION.md

@@ -0,0 +1,7 @@
+## Contribution
+### Frontend
+I am not very familiar with frontend stack and am actively looking for frontend contributors. The structure of this project also allows integration of other frontends.
+
+### Backend
+Although this project is initially specific to Carla simulator, the current structure of backend allows quite easy integration of other simulators/backends. I believe some other things like ROS, 
+AirSim can be added as backends as well with quite few codes.

README.md

@@ -28,5 +28,10 @@ Although the container image is out-of-box to use, you are also welcome to build
 
 Refer to this [page](./docs/build.md) for building instructions.
 
-## Author
+## Contribution
+Please read [this](./CONTRIBUTION.md).
+
+## Author and Collaboration
 [Minjun Xu](https://github.com/mjxu96)   [email protected]
+
+Please contact me via email if you want more collaborations.