docs(): added linting and formatting docs

src/backend/README.md

@@ -121,3 +121,29 @@ just test-coverage
 ```bash
 just show-coverage
 ```
+
+## Linting && Formatting
+
+### Clone the project
+
+### Go to the project directory
+
+### Install dependencies
+
+```bash
+uv sync --all-extras
+```
+
+### Run format
+
+```bash
+just format
+```
+
+### Run lint
+
+```bash
+just lint
+# OR
+just fix # applies suggested fixes
+```