Add Daily Challenge for Day 16

Daily Challenges/Day_16.md

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+### **Day 16: CSS Grid Basics**
+
+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**:
+  - Creating grid layouts with CSS Grid.
+- **Resources**:
+  - [MDN Web Docs - CSS Grid](https://developer.mozilla.org/en-US/docs/Learn/CSS/CSS_layout/Grids)
+  - [CSS-Tricks - A Complete Guide to Grid](https://css-tricks.com/snippets/css/complete-guide-grid/)
+- **Mini Project**:
+  - Create a grid-based layout for a simple webpage, using CSS Grid to arrange content in a grid format.