adding endpoint for log in

server/src/controllers/AuthenticationController.js

@@ -23,14 +23,23 @@ module.exports={
                 }
             })
             if (!user) {
-                res.status(403).send({
+                return res.status(403).send({
                     error: 'The login information was incorrect'
                 })
             }
-            res.send(user.toJSON())
+            const isPasswordValid = password === user.password
+            if(!isPasswordValid) {
+                return res.status(403).send({
+                    error: 'The login information was incorrect'
+            })
+        }
+            const userJson = user.toJSON()
+            res.send({
+                user: userJSON
+            })
             }catch (err){
-                res.status(400).send({
-                    error: 'This email account is already in use.'
+                res.status(500).send({
+                    error: 'An error has occured trying to log in'
                 })
             }
     }