added new endpoint

src/services/user.js

@@ -43,6 +43,12 @@ class UserService {
     async getAllGroupsForUser(userId) {
         return (await db.query("SELECT groups FROM users WHERE id = $1", [userId])).rows[0].groups
     }
+
+    async getById(userId) {
+        let res = (await db.query("SELECT * FROM users WHERE id = $1", [userId]))
+        if (res.rowCount == 0) throw new customError(`getById no user found`, responseCodes.responses.user.not_found)
+        return res.rows[0]
+    }
 }
 
 export default new UserService();