Create README.md

README.md

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+debug
+==
+A meta-language for debugging, based on sugar/debug from [mbutterick/sugar](https://github.com/mbutterick/sugar)
+
+To debug the value of an expression, simply put `debug` in front of the language at the top of
+the file (for instance `#lang debug racket`), and put `#R`, `#RR` or `#RRR` in front of the
+expression.
+
+- `#R` reports the value and returns it
+- `#RR` reports the value with a line number and returns it
+- `#RRR` reports the value with the file and line number, and returns it
+
+```racket
+#lang debug racket
+#R(+ 1 2)
+```
+Shows the output:
+```
+(+ 1 2) = 3
+3
+```
+
+```racket
+#lang debug racket
+(+ 1 2 #R(* 3 4))
+```
+Shows the output:
+```
+(* 3 4) = 12
+15
+```