Lua port and readme for 29_Craps added

29_Craps/lua/README.md

@@ -1,3 +1,17 @@
 Original source downloaded [from Vintage Basic](http://www.vintage-basic.net/games.html)
 
-Conversion to [Lua](https://www.lua.org/)
+Conversion to [Lua](https://www.lua.org/) by Alex Conconi
+
+---
+
+#### Lua porting notes
+
+-  The `craps_main` function contains the main game loop, which iteratively
+plays craps rounds by calling `play_round` and tracks winnings and losings.
+- Replaced the original routine that tries to scramble the random number
+generator with a proper seed initializer in Lua: `math.randomseed(os.time())`
+(as advised in the general porting notes). 
+= Added basic input validation to accept only positive integers for the
+wager and the answer to the "If you want to play again print 5" question.
+- "If you want to play again print 5 if not print 2" reads a bit odd but
+we decided to leave it as is and stay true to the BASIC original version.