Add development documentation (#64)

README.md

@@ -3,3 +3,47 @@
 > [!WARNING]
 > This is still a work in progress. Any usage of this package is subject to
 > change without notice.
+
+## Developing
+
+After cloning the repository make sure to install dependencies.
+
+```console
+npm ci
+```
+
+### Linting
+
+```console
+# currently only eslint
+npm run lint
+
+# eslint only
+npm run lint:eslint
+```
+
+### Formatting
+
+```console
+# currently only eslint
+npm run fix
+
+# eslint only
+npm run fix:eslint
+```
+
+### Testing
+
+```console
+# lint, unit tests and integration tests
+npm test
+
+# unit tests and integration tests only
+npm run test:all
+
+# unit tests only
+npm run test:unit
+
+# integration tests only
+npm run test:integration
+```