Update templates/signup.html

templates/signup.html

@@ -85,6 +85,8 @@
             
             <label for="password">Password:</label>
             <input type="password" id="password" name="password" placeholder="Enter your password" required>
+            <label for="referral">Referral Code:</label>
+            <input type="text" id="referral" name="referral" placeholder="Enter referral code (optional)">
             
             <button type="submit">Sign Up</button>
         </form>