fix checkboxes, refine guidance

projects/Assignments/homework3/README.md

 # Homework Assignment 3 (draft)
 
-[ ] Add X3D-Edit as Netbeans Plugin from https://savage.nps.edu/X3D-Edit/#Downloads
+1. [ ] Add X3D-Edit as Netbeans Plugin from https://savage.nps.edu/X3D-Edit/#Downloads
 
-[ ] Optional: checkout Open-DIS-Java library source from https://github.com/open-dis/open-dis-java
+1. [ ] Optional: checkout Open-DIS-Java library source from https://github.com/open-dis/open-dis-java
 
-[ ] 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)s
+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)
 
-[ ] Create YournameREADME.md documentation file and YourNameSomething from one of the example files...
+1. [ ] Copy README.md and create YournameREADME.md documentation file...
 
-[ ] Plan a track of interest, described in YournameREADME.md documentation file...
+1. [ ] Plan a track of interest, described in YournameREADME.md documentation file...
 
-[ ] Copy, then Refactor/Rename example file OpenDisEspduSender or OpenDisPduSender...
+1. [ ] Copy, then Refactor/Rename example file OpenDisEspduSender.java or OpenDisPduSender.java as YourNameSomething.java
 
-[ ] Modify your example file to produce track PDUs (and be cool)
+1. [ ] Modify your example file to produce track PDUs (and be cool)
 
-[ ] Generate PDUs...
+1. [ ] Generate PDUs...
 
-[ ] Test PDU reading using Wireshark...
+1. [ ] Test PDU reading using Wireshark...
 
-[ ] Record PDU file using X3D-Edit...
+1. [ ] Record PDU file using X3D-Edit...
 
-[ ] Playback PDU file using X3D-Edit...
+1. [ ] Playback PDU file using X3D-Edit...