Add badges

Author: brettcannon

CONTRIBUTING.md

@@ -1,5 +1,9 @@
 # Contributing to the Python extension for Visual Studio Code
 
+[![Build Status (Travis)](https://travis-ci.org/Microsoft/vscode-python.svg?branch=master)](https://travis-ci.org/Microsoft/vscode-python) [![Build status (AppVeyor)](https://ci.appveyor.com/api/projects/status/s0pt8d79gqw222j7?svg=true)](https://ci.appveyor.com/project/DonJayamanne/vscode-python-v3vd6) [![codecov](https://codecov.io/gh/Microsoft/vscode-python/branch/master/graph/badge.svg)](https://codecov.io/gh/Microsoft/vscode-python)
+
+
+
 ## Contributing a pull request
 
 ### Prerequisites