Add lua ebook. (#6857)

* Add lua ebook. * Rewrite link * Add credits to Stackoverflow in a Lua ebook * Add "(PDF)" in final line
EbookFoundation · Jun 18, 2022 · a7558f5 · a7558f5
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commit a7558f5
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diff --git a/books/free-programming-books-langs.md b/books/free-programming-books-langs.md
@@ -1490,6 +1490,7 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 
 ### Lua
 
+* [Learning Lua ebook](https://riptutorial.com/Download/lua.pdf) - Rip Tutorial (Compiled from StackOverflow documentation) (PDF)
 * [Lua 5.3 Reference Manual](http://www.lua.org/manual/5.3/)
 * [Lua Programming](https://en.wikibooks.org/wiki/Lua_Programming) - Wikibooks
 * [Lua Tutorial](http://www.tutorialspoint.com/lua/) - Tutorials Point (HTML, PDF)