Rename pyo3 directory to python

Also update the crate's name.

python/README.md

@@ -0,0 +1,42 @@
+# libloot-python
+
+An **experimental** Python wrapper around the libloot Rust implementation, built using [PyO3](https://pyo3.rs).
+
+## Build
+
+To build, first set up a Python virtual environment and install [maturin](https://github.com/PyO3/maturin):
+
+```powershell
+python -m venv .venv
+.\.venv\Scripts\activate
+pip install maturin
+```
+
+or in a POSIX shell:
+
+```sh
+python -m venv .venv
+. .venv/bin/activate
+pip install maturin
+```
+
+Then build the library in the virtual environment:
+
+```
+maturin develop
+```
+
+The library can then be imported in Python:
+
+```
+python
+> import loot
+```
+
+## Usage notes
+
+- The Python exceptions that errors are mapped to are not the same as in the Rust or C++ interfaces:
+    - The API provides the custom `CyclicInteractionError`, `UndefinedGroupError`, `EspluginError` exception types.
+    - All other errors are raised as `ValueError` exceptions.
+    - There's no equivalent to the C++ interface's `FileAccessError` or `ConditionSyntaxError` classes or the libloadorder and loot-condition-interpreter system error categories.
+- The `LogLevel` enum and `set_logging_callback()` and `set_log_level()` functions are not exposed because the logging is integrated with Python's `logging` module instead.