Updated gitignore and added submodule

- Added a filebrowser for imgui submodule
- Added gitignore entries for two submodules

.gitignore

@@ -16,4 +16,9 @@ x64/
 *.gltf
 !sponza.gltf
 
-imgui.ini
+imgui.ini
+libs/physx/physx/include/
+libs/physx/physx/compiler/
+libs/physx/physx/buildtools/
+libs/physx/physx/bin/
+libs/nativefiledialog/build/

.gitmodules

@@ -39,3 +39,6 @@
 [submodule "libs/mINI"]
 	path = libs/mINI
 	url = https://github.com/pulzed/mINI.git
+[submodule "libs/imgui-filebrowser"]
+	path = libs/imgui-filebrowser
+	url = https://github.com/AirGuanZ/imgui-filebrowser.git

libs/imgui-filebrowser

@@ -0,0 +1 @@
+Subproject commit cfccc2aab651cb19cbc2c3ad36be78c36078ec76