Check to See if the User is in the Database

login.html

 // omitted code 
 <form method="POST" class="navbar-form nav-center pull-right" action="/process_login">

      <div class="form-group">

          <input type="text" placeholder="Username" class="form-control" name="user_name">
          <input type="hidden" name="action" value="signIn">
          </div>
       
           <div class="form-group">
            <input type="password" placeholder="Password" class="form-control" name="password">
          </div>

           <div class="form-group">
        
         <input type="email" placeholder="Email" class="form-control" name="email">

             <button type="submit" class="btn btn-success">Log In </button>

             <p style="font-size:8px"> Don't have an account? <a href = "/register_user">Register</a> </p>
    </div>
  </form>
  // omitted code