README update

README.md

@@ -2,7 +2,7 @@
 
 ## install
 
-```
+```bash
 python -m venv .venv
 source .venv/bin/activate
 pip install -e .
@@ -10,7 +10,15 @@ pip install -e .
 
 ## run tests
 
-```
+```bash
 pip install pytest
 pytest
 ```
+
+## run sagemath script
+
+`deactivate` the venv first, then with sagemath installed:
+
+```bash
+./run_sage.sh
+```