[Oberon] Git usage for A2.

[peter at easthope.ca]

Starting UnixAos is simple enough.
  cd <myWorkingDirectory>
  aos
  
Starting repository based UnixA2 involves a2.sh, a2.txt, oberon.ini, 
directory "work" and pseudo-volume WORK.  Definitely a larger 
challenge for a novice.  I've added some explanation at the foot of 
this section.
https://en.wikibooks.org/wiki/Oberon/A2#Git_in_a_Unix-like_System

Difficulties?  Errors?  Feedback appreciated.

Thx,                            ... P.L.

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