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/routers.py

@@ -0,0 +1,18 @@
+from argenta import Command, Response, Router
+from argenta.command import Flag, Flags
+from argenta.command.flag import ValidationStatus
+
+work_router: Router = Router(title="Base points:")
+
+
+@work_router.command(
+    Command(
+        "hello",
+        flags=Flags([
+            Flag("test")
+        ]),
+        description="Hello, world!")
+)
+def command_help(response: Response):
+    n = input('sfgdheth')
+    print(f"Hello,{n} {response.input_flags.get_flag_by_name('test', with_status=ValidationStatus.VALID)}")