Added LGTM Alert Badge

README.md

@@ -70,3 +70,4 @@ for more info.
 [![AppVeyor Build Status](https://ci.appveyor.com/api/projects/status/bfiihqq6byxsjxxh/branch/master?svg=true)](https://ci.appveyor.com/project/akien-mga/godot)
 [![Code Triagers Badge](https://www.codetriage.com/godotengine/godot/badges/users.svg)](https://www.codetriage.com/godotengine/godot)
 [![Translate on Weblate](https://hosted.weblate.org/widgets/godot-engine/-/godot/svg-badge.svg)](https://hosted.weblate.org/engage/godot-engine/?utm_source=widget)
+[![Total alerts on LGTM](https://img.shields.io/lgtm/alerts/g/godotengine/godot.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/godotengine/godot/alerts)