Added LGTM quality badge

README.md

@@ -9,7 +9,7 @@
 [Git repository](https://github.com/FreeCAD/FreeCAD)
 
 
-[![Release](https://img.shields.io/github/release/freecad/freecad.svg)](https://github.com/freecad/freecad/releases/latest) [![Master][freecad-master-status]][travis-branches] [![Crowdin](https://d322cqt584bo4o.cloudfront.net/freecad/localized.svg)](https://crowdin.com/project/freecad) [![Gitter](https://img.shields.io/gitter/room/freecad/freecad.svg)](https://gitter.im/freecad/freecad?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[![Release](https://img.shields.io/github/release/freecad/freecad.svg)](https://github.com/freecad/freecad/releases/latest) [![Master][freecad-master-status]][travis-branches] [![Crowdin](https://d322cqt584bo4o.cloudfront.net/freecad/localized.svg)](https://crowdin.com/project/freecad) [![Gitter](https://img.shields.io/gitter/room/freecad/freecad.svg)](https://gitter.im/freecad/freecad?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [![Language grade: Python](https://img.shields.io/lgtm/grade/python/g/FreeCAD/FreeCAD.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/FreeCAD/FreeCAD/context:python)
 
 
 ![screenshot](http://www.freecadweb.org/wiki/images/thumb/7/72/Freecad016_screenshot1.jpg/800px-Freecad016_screenshot1.jpg)