Add initial project files and clean-up script

- Created a PowerShell script `clean.ps1` to remove build artifacts and temporary files.
- Added default instance configurations for "Default" and "Legacy Evolved" in JSON format.
- Introduced a guide in JSONC format detailing instance setup and configuration.
- Added an About dialog UI in XML format for the application.
- Included a license string for the GNU General Public License v3 in `license_str.py`.

.github/workflows/nightly.yml

@@ -14,7 +14,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, windows-latest]
+        os: [windows-latest]
+        # disabled temporaly due to a problem os: [ubuntu-latest, windows-latest]
 
     runs-on: ${{ matrix.os }}
 
@@ -45,10 +46,12 @@ jobs:
         run: |
           Compress-Archive -Path dist/main.dist/* -DestinationPath LCE-Qt-Launcher-Windows.zip
 
-      - name: Package Linux build
-        if: matrix.os == 'ubuntu-latest'
-        run: |
-          tar -czf LCE-Qt-Launcher-Linux.tar.gz -C dist/main.dist .
+      # also disabled temporaly
+      # - name: Package Linux build
+      #   if: matrix.os == 'ubuntu-latest'
+      #   run: |
+      #     tar -czf LCE-Qt-Launcher-Linux.tar.gz -C dist/main.dist .
+
       - name: Upload Nightly
         uses: andelf/nightly-release@main
         env:
@@ -57,11 +60,11 @@ jobs:
           tag_name: nightly
           name: Nightly Release
           body: "
-            > [!NOTE]
-            > There is no MacOS pre-compiled build since, I do not have a mac
-            > to the software, so a compilation from source is needed to test
-            > on MacOS
-
+            > [!NOTE]\n
+            > There is no MacOS pre-compiled build since, I do not have a mac\n
+            > to the software, so a compilation from source is needed to test\n
+            > on MacOS\n
+            
             Experimental Build (Nightly) generated by GitHub Action.
             The nighy build are experimental nuitka compilation
             from the nighly version for the more stable build,