revert gitignore

Author: jakes-adobe

.gitignore

@@ -53,4 +53,7 @@ test/assets/fbx/*.usd
 test/assets/gltf/*.usd
 test/assets/obj/*/*.usd
 test/assets/ply/*.usd
-test/assets/stl/*.usd
+test/assets/stl/*.usd
+
+# Other
+.DS_Store