feat: impl docs (#4)

The entire public api is covered with documentation in two languages - Russian and English.

the library now supports the latest three versions of python - 3.12, 3.13 and 3.14

minor design changes: now, when a Boolean flag is entered, its value is an empty string, not None.

tests have been adapted to the supported versions of python, readmi has been redesigned in two languages, German is no longer available.

docs/code_snippets/argspace/snippet3.py

@@ -0,0 +1,21 @@
+from argenta import Response, Router
+from argenta.di import FromDishka
+from argenta.orchestrator.argparser import ArgSpace, BooleanArgument, ValueArgument
+
+router = Router()
+
+
+@router.command("get_args")
+def get_args(response: Response, argspace: FromDishka[ArgSpace]):
+    # Get all boolean flags
+    boolean_flags = argspace.get_by_type(BooleanArgument)
+    print(f"Active flags: {[arg.name for arg in boolean_flags if arg.value]}")
+
+    # Get all value arguments
+    value_args = argspace.get_by_type(ValueArgument)
+    for arg in value_args:
+        print(f"{arg.name} = {arg.value}")
+
+    # Count arguments of each type
+    print(f"Boolean arguments: {len(argspace.get_by_type(BooleanArgument))}")
+    print(f"Value arguments: {len(argspace.get_by_type(ValueArgument))}")