add append, specials

README.md

@@ -61,4 +61,31 @@ Welcome to Racket v7.5.0.900.
 '((x 1) (y 2))  ; that's not a hash map...
 ```
 
+- `append` semantics
+
+append with an empty list as the first argument just returns the second argument, regardless of what
+it is
+
+```scheme
+Welcome to Racket v7.5.0.900.
+> (append '(1 2) '#(1 2))
+'(1 2 . #(1 2))
+> (append '() '#(1 2))
+'#(1 2)
+> (append (list) '#(1 2))
+'#(1 2)
+```
+
+- specials
+
+why use async channels when u can
+
+```scheme
+> (define-values [in out] (make-pipe-with-specials))
+> (write-special + out)
+#t
+> (read-char-or-special in)
+#<procedure:+>
+```
+
 - **TODO** more