Add warning for when the user clones this repo to their talon user folder (#275)

Author: david-tejada

talon_warning.py

@@ -0,0 +1,6 @@
+from talon import app
+
+def on_ready():
+  app.notify("Error: wrong repository cloned. Remove the rango repository from your talon user folder and clone rango-talon instead.")
+
+app.register("ready", on_ready)