add language declaration and samples for LoomScript

LoomScript is the scripting language for the Loom SDK.
It has an ActionScript3-like syntax with added C#-esque capabilities.

Loom SDK: https://github.com/LoomSDK/LoomSDK

lib/linguist/languages.yml

@@ -1492,6 +1492,12 @@ LookML:
   - .lookml
   tm_scope: source.yaml
 
+LoomScript:
+  type: programming
+  lexer: ActionScript 3
+  extensions:
+  - .ls
+
 Lua:
   type: programming
   ace_mode: lua