readme updates

Author: UserNobody14

README.md

@@ -4,3 +4,16 @@ This repository contains pre-commit hooks for pyrefly.
 
 ## Installation
 
+```yaml
+  - repo: https://github.com/UserNobody14/pyrefly-precommit
+    rev: '0.0.1'
+    hooks:
+      - id: pyrefly
+        args: ["check", "--python-interpreter", ".venv/bin/python3"]
+```
+
+## Usage
+
+```bash
+pre-commit run --all-files
+```