initial checkbox markings

projects/Assignments/homework3/README.md

-# Homework Assignment 3 (draft)
+## Homework Assignment 3 Checklist
 
-1. [ ] Add X3D-Edit as Netbeans Plugin from https://savage.nps.edu/X3D-Edit/#Downloads
+1. [x] Add X3D-Edit as Netbeans Plugin from https://savage.nps.edu/X3D-Edit/#Downloads
 
-1. [ ] Optional: checkout Open-DIS-Java library source from https://github.com/open-dis/open-dis-java
+1. [x] Optional: checkout Open-DIS-Java library source from https://github.com/open-dis/open-dis-java
 
-1. [ ] Otherwise just inspect files of interest from
-    [edu.nps.moves.examples](https://github.com/open-dis/open-dis-java/tree/master/src/main/java/edu/nps/moves/examples)
+1. [x] Otherwise just inspect files of interest from
+   [edu.nps.moves.examples](https://github.com/open-dis/open-dis-java/tree/master/src/main/java/edu/nps/moves/examples)
 
 1. [ ] Copy README.md and create YournameREADME.md documentation file...