User should see a success message after login/signup

Describe the Issue
Currently, nothing will post to the screen after a successful user signup or user login. This way, the user doesn't know if they actually created an account or logged in. This could create a problem where the user repeatedly attempts to sign up or log in due to their uncertainty.

Expected behavior
When a user submits the correct information to create an account or log in to an existing account, they should see a message notifying them that their attempt was successful.

To Reproduce
1. Start the app using npm run start
2. Go to localhost:3000
3. --->Select the signup tab... Enter an 8+ character username and an 8+ character password and then repeat the password for the verification.
OR
3. --->Select the login tab... Enter an existing username and password combination.
4. Click submit.
5. View the blank fields with no "success" alert - here is the issue.