updated readme

README.md

 
 
 ## Instructions
+* Research `FileWriter` to ensure you know [how to](https://www.journaldev.com/20891/java-filewriter-example) `read`, `write`, and `flush` data.
+* It is advised that you begin by implementing `read` and `write` for the `Document`.
 * Ensure each of the test classes passes with 100% pass rate.