Add validation to login and signup form

[rrjoson]

Scenario 1

• GIVEN that a user is in the login page
• AND the form fields are empty
• AND they try to click log in button
• THEN it should show a front end validation

Scenario 2

• GIVEN that a user is in the signup page
• AND the form fields are empty
• AND they try to click signup button
• THEN it should show a front end validation

Notes

• Use HTML5 form validation

Screenshots