Further docs

README.md

@@ -4,6 +4,14 @@
 
 Automate your mass typo updates.
 
+## Run/Hack
+
+```
+$ python3 -m venv .venv && source .venv/bin/activate 
+$ pip install -r requirements.txt
+$ python mymigration.py --yaml
+```
+
 ## CLI
 
 - **--reset**: run `git-checkout` on all of your glob matches and exit