Add Thinking Forth

README.md

@@ -330,6 +330,7 @@ If you like Mind Expanding books you should check out my new project http://diff
 | Labyrinths of Reason: Paradox, Puzzles, and the Frailty of Knowledge | William Poundstone | [4.05](https://www.goodreads.com/book/show/55436.Labyrinths_of_Reason) | 1989 |  
 | Mazes for the Mind: Computers and the Unexpected | Clifford A. Pickover | [4.05](https://www.goodreads.com/book/show/1986400.Mazes_for_the_Mind) | 1992 |
 | Outnumbered: Exploring the Algorithms That Control Our Lives | David Sumpter | [3.99](https://www.goodreads.com/book/show/36762542-outnumbered) | 2018 |
+| Thinking Forth: A Language and Philosophy for Solving Problems | Leo Brodie | [3.96](https://www.goodreads.com/book/show/2995657-thinking-forth) | 1984 |
 
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