feat: add T-shirt colour dropdown with 3 options

Author: codebyra

Form-Controls/index.html

@@ -36,7 +36,13 @@ <h1>Product Pick</h1>
 
 <fieldset>
   <legend>T-Shirt Options</legend>
-  <!-- colour + size will go here -->
+  <label for="colour">T‑Shirt Colour</label>
+  <select id="colour" name="colour" required>
+    <option value="">-- Select a colour --</option>
+    <option value="red">Red</option>
+    <option value="black">Black</option>
+    <option value="white">White</option>
+  </select>
 </fieldset>
 
 <button type="submit">Submit Order</button>