Add Daily Challenge for Day 19

Daily Challenges/Day_19.md

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+### **Day 19: CSS Transitions and Animations**
+
+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**:
+  - Basic transitions and animations.
+- **Resources**:
+  - [MDN Web Docs - CSS Transitions](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Transitions/Using_CSS_transitions)
+  - [W3Schools - CSS Animations](https://www.w3schools.com/css/css3_animations.asp)
+- **Mini Project**:
+  - Create a simple animation on a webpage element, such as a button that changes color when hovered over.