Add registration feature

js/register.js

@@ -0,0 +1,27 @@
+const form = document.querySelector(".register form"),
+  continueBtn = form.querySelector(".button input"),
+  errorText = form.querySelector(".error");
+
+form.onsubmit = (e) => {
+  e.preventDefault();
+};
+
+continueBtn.onclick = () => {
+  let xhr = new XMLHttpRequest();
+  xhr.open("POST", "php/register.php", true);
+  xhr.onload = () => {
+    if (xhr.readyState === XMLHttpRequest.DONE) {
+      if (xhr.status === 200) {
+        let data = xhr.response;
+        if (data === "success") {
+          location.href = "home.php";
+        } else {
+          errorText.style.display = "block";
+          errorText.textContent = data;
+        }
+      }
+    }
+  };
+  let formData = new FormData(form);
+  xhr.send(formData);
+};