add threading codemod docs

docs/codemods/python/pixee_python_bad-lock-with-statement.md

@@ -0,0 +1,43 @@
+---
+title: Separate Lock Instantiation from `with` Call
+sidebar_position: 1
+---
+
+## pixee:python/bad-lock-with-statement
+
+| Importance | Review Guidance            | Requires SARIF Tool |
+|------------|----------------------------|---------------------|
+| Low       | Merge Without Review | No                  |
+
+This codemod separates creating a threading lock instance from calling it as a context manager.
+Calling `with threading.Lock()` does not have the effect you would expect. The lock is not acquired.
+Instead, to correctly acquire a lock, create the instance separately, before calling it as a context manager.
+
+The change will apply to any of these `threading` classes: `Lock`, `RLock`, `Condition`, `Semaphore`, and `BoundedSemaphore`.
+
+The change looks like this:
+
+```diff
+  import threading
+- with threading.Lock():
++ lock = threading.Lock()
++ with lock:
+     ...
+```
+
+If you have feedback on this codemod, [please let us know](mailto:[email protected])!
+
+## F.A.Q.
+
+### Why is this codemod marked as Merge Without Review?
+
+We believe this replacement is safe and should not result in any issues.
+
+## Codemod Settings
+
+N/A
+
+## References
+
+* [https://pylint.pycqa.org/en/latest/user_guide/messages/warning/useless-with-lock.](https://pylint.pycqa.org/en/latest/user_guide/messages/warning/useless-with-lock.)
+* [https://docs.python.org/3/library/threading.html#using-locks-conditions-and-semaphores-in-the-with-statement](https://docs.python.org/3/library/threading.html#using-locks-conditions-and-semaphores-in-the-with-statement)