Merge branch 'code-differently:main' into lesson_17

Author: Cogbonnia

lesson_21/README.md

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+# Lesson 21: Computer Languages
+
+## Pre-work
+
+Please review the following resources before lecture:
+
+* [Programming Paradigms Explained (Video)](https://www.youtube.com/watch?v=H5uA6p_pK-Y)
+* [Ditch your Favorite Programming Paradigm (Video)](https://www.youtube.com/watch?v=UOkOA6W-vwc)
+
+## Homework
+
+- [ ] Do pre-work for [lesson 22](/lesson_22/).

lesson_22/README.md

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+# Lesson 22: Building Applications
+
+## Pre-work
+
+Please review the following resources before lecture:
+
+### Required
+* [Frontend web development - a complete overview (Video)](https://www.youtube.com/watch?v=WG5ikvJ2TKA)
+* [Backend web development - a complete overview (Video)](https://www.youtube.com/watch?v=XBu54nfzxAQ)
+* [3 Tier Architecture (Video)](https://www.youtube.com/watch?v=THPg8Hz2zZo)
+
+### Recommended
+* [What is an API (in 5 minutes) (Video)](https://www.youtube.com/watch?v=ByGJQzlzxQg)
+
+## Homework
+
+TODO(anthonydmays): Complete this