Add initial implementation of Minecraft LCE QT Launcher

- Added assets including Minecraft icon and styles for the UI.
- Created a Code of Conduct to promote inclusivity and respect within the community.
- Implemented app configuration management with `app_config.py` and `config.py`.
- Developed instance management functionality in `instance_manager.py`.
- Introduced a downloader class for handling client downloads in `downloader.py`.
- Designed the main UI layout using Qt Designer in `form.ui`.
- Established the main application logic in `launcher.py`, including command-line argument handling.
- Added system management capabilities to detect the operating system in `system_manager.py`.

.gitignore

@@ -30,7 +30,6 @@
 .qmake.cache
 .qmake.stash
 .qmlls.ini
-.vscode
 .axivion
 Makefile*
 Thumbs.db
@@ -288,7 +287,7 @@ tmp/
 /*-debug/
 /*-release/
 /out/
-rc_res.py
-ui_form.py
+**/res_rc.py
+**/ui_form.py
 
 MinecraftLCEClient/