feat(backend): add GET /api/materiels catalogue endpoint

eme-backend/src/routes/index.ts

@@ -0,0 +1,8 @@
+import { Router } from 'express';
+import { currentUser } from '../middlewares/current-user';
+import { materielRoutes } from './materiel.routes';
+
+export const apiRouter: Router = Router();
+
+apiRouter.use(currentUser);
+apiRouter.use('/materiels', materielRoutes);