add get all users/groups routes

src/routes/access/groups.js

@@ -0,0 +1,16 @@
+import { Router } from "express";
+export const router = Router({ mergeParams: true });
+
+/**
+ * GET - get all groups
+ * responses:
+ * - 200: {auth:true, groups: Array}
+ * - 201: {auth: false}
+ */
+router.get("/", async (req, res) => {
+    const auth = await checkAuth(req.cookies, res);
+	if (!auth) {
+		return;
+	}
+    res.status(200).send(global.userManager.getAllGroups())
+});