Add cxyz Android project structure and initial configuration

- Introduced a new Flutter project for the cxyz Android manga/comic reader, including essential files such as pubspec.yaml, AndroidManifest.xml, and Gradle configuration.
- Added .gitignore files to exclude unnecessary files and directories for both the main project and Android-specific files.
- Implemented initial README.md with project description, features, setup instructions, and API details for ComicLand, MangaRead, and MangaTown.
- Configured analysis options and dependencies in pubspec.yaml to support Flutter development.
- Established a pnpm workspace and lockfile for dependency management.
- Included various Android resources such as icons, styles, and launch backgrounds for a complete application setup.

cxyz-android/analysis_options.yaml

@@ -0,0 +1,19 @@
+# Extra analysis options for Drift / Flutter.
+include: package:flutter_lints/flutter.yaml
+
+analyzer:
+  exclude:
+    - "**/*.g.dart"
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
+  errors:
+    invalid_annotation_target: ignore
+
+linter:
+  rules:
+    prefer_const_constructors: false