Add Daily Challenge for Day 28

Daily Challenges/Day_28.md

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+### **Day 28: Working with Forms**
+
+Welcome to another day of growth and learning! 🚀 Embrace today's challenge with enthusiasm and determination. Remember, every line of code you write brings you one step closer to mastering your craft. Let's make today count! 💪
+
+- **Topics to Learn**:
+  - Validating form inputs with JavaScript.
+  - Checking required fields and input formats.
+  - Displaying custom validation messages.
+  - Using the `submit` event to validate before submission.
+- **Resources**:
+  - [MDN Web Docs - Form Validation](https://developer.mozilla.org/en-US/docs/Learn/Forms/Form_validation)
+  - [W3Schools - JavaScript Form Validation](https://www.w3schools.com/js/js_validation.asp)
+- **Mini Project**:
+  - Create a form that validates user input and provides feedback if fields are missing or incorrectly filled.