[+] Verify username and password for register

ProjectClock/AccountViewController.swift

@@ -25,6 +25,16 @@ class LoginVC: UIViewController
     
     @IBAction func register(_ sender: Any)
     {
+        // Verify username and password
+        guard username.text ~= "[A-Za-z0-9_-]{3,16}" else
+        {
+            alert("Username Invalid", "Username must be 3 to 16 characters long, and must only contain a-z, 0-9, underscore, and minus signs (-).")
+            return
+        }
+        guard password.text?.count? > 8 else
+        {
+            alert("Password Invalid", "Password must be more than 8 characters long")
+        }
         
     }