Release v4.0.0 - Source Code & Documentation

- Complete source code for Windows client, PS5 payload, and mobile app
- Updated README.md with v4.0.0 features
- Updated CHANGELOG.md with detailed changes
- Added .gitignore to exclude binaries
- Retry failed transfers feature
- Performance optimizations
- Bug fixes and stability improvements

Note: Binaries will be provided in GitHub Releases

.gitignore

@@ -0,0 +1,19 @@
+# Build outputs
+bin/
+obj/
+*.exe
+*.dll
+*.pdb
+*.apk
+*.aab
+
+# Visual Studio
+.vs/
+*.user
+*.suo
+
+# Rider
+.idea/
+
+# Logs
+*.log