Added note about git-lfs

README.md

@@ -4,4 +4,9 @@
 ## Third Person Shooter Demo
 
 This third person shooter demo made using Godot, make sure to update to latest
-HEAD to test.
+HEAD to test.
+
+## Git-LFS
+
+If you plan to checkout or submit PRs to this repo, git-lfs support is
+required, due to the large size of many files.