Update docs

INSTALL.md

@@ -85,6 +85,14 @@ The project uses [Black](https://black.readthedocs.io/en/stable/) for code forma
 
     black .
 
+Additionally, this project uses [ruff](https://beta.ruff.rs/docs/) for linting. You can run it with:
+
+    ruff . 
+
+ruff has in-built functionality to fix common linting errors. Use the `--fix` option to do this.
+
+Both Black and ruff are both automatically called as part of pytest in this project.
+
 A pre-commit hook is defined in the project to run it automatically before each commit. See the [pre-commit docs](https://pre-commit.com/#quick-start) for more information, or simply run the below command to setup:
 
     pre-commit install