Add lesson 10

Added lesson 10.

Author: Vandreic

README.md

@@ -14,7 +14,7 @@ The website is hosted on GitHub Pages. Click [here](https://vandreic.github.io/H
 - [x] 7. Images and Text Boxes
 - [x] 8. CSS Display Property
 - [x] 9. The div Element
-- [ ] 10. Nested Layouts Technique
+- [x] 10. Nested Layouts Technique
 - [ ] 11. CSS Grid
 - [ ] 12. Flexbox
 - [ ] 13. Nested Flexbox

index.html

@@ -19,7 +19,7 @@ <h2>Lessons</h2>
         <li><a href="lessons/lesson-07/lesson-07.html">Lesson 7: Images and Text Boxes</a></li>
         <li><a href="lessons/lesson-08/lesson-08.html">Lesson 8: CSS Display Property</a></li>
         <li><a href="lessons/lesson-09/lesson-09.html">Lesson 9: The div Element</a></li>
-        <li>Lesson 10: Nested Layouts Technique</li>
+        <li><a href="lessons/lesson-10/lesson-10.html">Lesson 10: Nested Layouts Technique</a></li>
         <li>Lesson 11: CSS Grid</li>
         <li>Lesson 12: Flexbox</li>
         <li>Lesson 13: Nested Flexbox</li>