new egg: coin-change

It's that time of year again.

I bring you coin-change, a greedy solver for the coin change problem[0] 
(NOT the solutions counting problem).

Tests are on the light side as of now (I'll try adding more 
comprehensive tests eventually), but do not you worry: I ran it twice 
and it worked!  (o:[]>o

You can find the docs in the wiki[1], the repo here[2], and the 
release-info here[3].


test-new-egg report:

   Fetching........................................[ ok ] 0s
   Reading .egg....................................[ ok ] 0s
   Checking dependencies...........................[ ok ] 0s
   Checking category...............................[ ok ] 0s
   Checking license................................[ ok ] 0s
   Checking author.................................[ ok ] 0s
   Installing......................................[ ok ] 8s
   Checking version................................[ -- ]
   Testing.........................................[ ok ] 10s
   Checking documentation..........................[ ok ] 0s


[0]: https://en.wikipedia.org/wiki/Change-making_problem
[1]: https://wiki.call-cc.org/eggref/5/coin-change
[2]: https://git.sr.ht/~siiky/coin-change
[3]: https://git.sr.ht/~siiky/coin-change/blob/main/coin-change.release-info

Thanks,
siiky