chore: adds lesson_04 pre-work

Author: anthonydmays

lesson_04/README.md

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+# Lesson 04: How to Be A Great Software Engineer
+
+## Pre-work
+
+Please review the following resources before lecture:
+
+* [10 must-have Software Engineering Skills | Reaction (Video)](https://www.youtube.com/watch?v=AMdSBKZgOJw)
+* [Mindset of Successful Programmers (Video)](https://www.youtube.com/watch?v=nogh434ykF0)
+
+## Homework
+
+TODO(anthonydmays): Add details