Bump version to 0.2.0 and enhance documentation

- Updated version number in pyproject.toml and __init__.py to 0.2.0.
- Revised README.md to reflect the current state of the project, including usage instructions and setup steps.
- Improved CLI documentation in cli.md, adding details about new commands and their functionalities.
- Enhanced the quick start section in README.md for better clarity on initial setup.
- Updated local folder documentation to clarify file handling and commands.
- Added a new command for listing GPU flavors and improved error handling in the CLI.
- Implemented a watchdog feature in the tunnel to manage server states effectively.

tests/test_resize.py

@@ -0,0 +1,32 @@
+import pytest
+
+from gpu_rent.errors import GpuRentError
+from gpu_rent.resize import resize_data_volume
+from gpu_rent.state import SessionState, save_state
+
+
+class _Cfg:
+    pass
+
+
+def test_resize_rejects_shrink(monkeypatch):
+    save_state(SessionState(data_volume_id="d1", floating_ip=None))
+
+    class Vol:
+        id = "d1"
+        size = 200
+        status = "in-use"
+
+    class Conn:
+        class block_storage:
+            @staticmethod
+            def get_volume(vid):
+                return Vol()
+
+            @staticmethod
+            def extend_volume(*a, **k):
+                raise AssertionError("no extend")
+
+    monkeypatch.setattr("gpu_rent.resize.connect", lambda cfg: Conn())
+    with pytest.raises(GpuRentError, match="вниз нельзя"):
+        resize_data_volume(_Cfg(), 100, log=lambda m: None)