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

examples/example_app/main.py

@@ -0,0 +1,26 @@
+from prompt_toolkit import HTML
+
+from argenta import App, Orchestrator
+from argenta.app import PredefinedMessages, StaticDividingLine, AutoCompleter
+from argenta.app.dividing_line.models import DynamicDividingLine
+from argenta.orchestrator import ArgParser
+from examples.example_app.routers import work_router
+
+app: App = App(
+    dividing_line=StaticDividingLine('~')
+)
+orchestrator: Orchestrator = Orchestrator()
+
+
+def main():
+    app.include_router(work_router)
+
+    app.add_message_on_startup(PredefinedMessages.USAGE)
+    app.add_message_on_startup(PredefinedMessages.AUTOCOMPLETE)
+    app.add_message_on_startup(PredefinedMessages.HELP)
+
+    orchestrator.run_repl(app)
+
+if __name__ == "__main__":
+    main()
+