Implement length constraint for message in Contact Us form (#919)

assets/contact/contact.js

@@ -17,4 +17,17 @@ ham.addEventListener("click", mobileMenu);
 function mobileMenu() {
     ham.classList.toggle("active");
     navMe.classList.toggle("active");
-}
+}
+
+// text message length not less than 50 chars
+document.addEventListener('DOMContentLoaded', function() {
+    const contactForm = document.getElementById('contact-form');
+    const messageInput = document.getElementById('message');
+
+    contactForm.addEventListener('submit', function(event) {
+        if (messageInput.value.length < 50) {
+            event.preventDefault();
+            alert('Your message must be at least 50 characters long.');
+        }
+    });
+});