chore: adds prework for lesson_27 (#621)

Signed-off-by: Anthony D. Mays <[email protected]>

Author: anthonydmays

lesson_27/README.md

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+# Lesson 27: Integrating with Backend APIs
+
+## Pre-work
+
+Please review the following resources before lecture:
+
+### Required
+* [Learn Fetch API In 6 Minutes (Video)](https://www.youtube.com/watch?v=cuEtnrL9-H0)
+* [Using Promises - MDN (Article)](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Using_promises)
+
+### Recommended
+* [How To Make API Call In React... (Video)](https://www.youtube.com/watch?v=ZRFwuGpiLl4)
+
+## Homework
+
+TODO(anthonydmays): Add necessary details