docs: add local testing and usage section to readme

Author: thunderbiscuit

README.md

@@ -3,3 +3,19 @@
 The Python language bindings for the [bitcoindevkit](https://github.com/bitcoindevkit).
 
 See the [package on PyPI](https://pypi.org/project/bdkpython/).
+
+## Local Testing and Usage
+
+1. Start a Python virtual environment
+2. Run one of the build script
+3. Create the wheel
+4. Install the library
+5. Run the tests
+
+```sh
+source .localpythonenv/bin/activate
+bash scripts/generate-macos-arm64.sh
+.localpythonenv/bin/python3 setup.py bdist_wheel
+.localpythonenv/bin/pip3 install ./dist/bdkpython-<yourversion>.whl --force-reinstall
+.localpythonenv/bin/python3 -m unittest --verbose
+```