docs: add CLI documentation section with translations and code snippets; refactor mock/ to examples/, improve CLI module (bug fixes, DX, error handling)

examples/example_min_app/main.py

@@ -0,0 +1,16 @@
+# main.py
+from argenta import App, Orchestrator
+from argenta.app import DynamicDividingLine
+
+from .routers import router
+
+app: App = App(prompt='>>> ', dividing_line=None)
+orchestrator: Orchestrator = Orchestrator()
+
+def main() -> None:
+    app.include_router(router)
+    orchestrator.run_repl(app)
+
+if __name__ == '__main__':
+    main()
+    

examples/example_min_app/routers.py

@@ -0,0 +1,9 @@
+# routers.py
+from argenta import Command, Response, Router
+
+router = Router(title="Quickstart Example")
+
+@router.command(Command("hello", description="Say hello"))
+def handler(response: Response):
+    print("Hello, world!")
+