add size options and submit button

Author: BrianY315

Form-Controls/task-Tshirts

@@ -86,4 +86,20 @@
       <option value="blue">Blue</option>
       <option value="black">Black</option>
     </select>
-    
+
+    <!-- Size -->
+    <label for="size">T‑Shirt Size</label>
+    <select id="size" name="size" required>
+      <option value="">-- Select a size --</option>
+      <option value="XS">XS</option>
+      <option value="S">S</option>
+      <option value="M">M</option>
+      <option value="L">L</option>
+      <option value="XL">XL</option>
+      <option value="XXL">XXL</option>
+    </select>
+
+    <button type="submit">Submit Order</button>
+  </form>
+</body>
+</html>