docs: update readme and add feature gif

Add a gif demonstrating filepath validation to `docs/` dir and display it in the README.md

Author: traunts

README.md

@@ -17,6 +17,11 @@ These allow you to quicky create definitions for properties, and tab through the
 
 ![snippets](docs/snippets.gif)
 
+Filepath validation of all references to module files within the workspace.
+This currently requires the base game directory to be open as a VSCode workspace.
+
+![filepaths](docs/filepathValidation.gif)
+
 ## Extension Settings
 
 _NA (Not currently implemented)_