add readme note about lisp similarities

README.md

@@ -4,3 +4,22 @@ Improved Stack-Based Programming Language
 Incomplete, not currently compilable, only interpretable.
 
 Stuff: [TudbuT/isbpl-random-stuff](https://github.com/TudbuT/isbpl-random-stuff)
+
+---
+
+## ISBPL is similar to Lisp:
+
+```lisp
+(print (+ 1 (* 1 2)))
+```
+is the same as
+```isbpl
+2 1 * 1 + print
+```
+or
+```isbpl
+( ( ( 2 1 * ) 1 + ) print )
+```
+in both languages, this will print 3.
+
+These examples used the print function, which does not exist by default, instead, puts should be used in combination with \_string.