feat: adds lesson_11 prework

Author: anthonydmays

lesson_11/README.md

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+# Lesson 11: Data Structures: Strings, Array, ArrayList
+
+## Pre-work
+
+Please review the following resources before lecture:
+
+* [An Overview of Arrays and Memory (Data Structures & Algorithms #2) (Video)](https://www.youtube.com/watch?v=pmN9ExDf3yQ)
+* [Java Data Structures Tutorial (Video)](https://www.youtube.com/watch?v=8MmMm2-kJV8&t=206s)
+
+## Homework
+
+TODO(anthonydmays): Add details