Document io and tag utils.

doc/utils.md

@@ -10,6 +10,8 @@ The modules are listed in alphabetical order.
 
 ### CSV
 
+    (import util-csv)
+
 This module provides a very simple, incomplete and incorrect but fast
 CSV loader.
 
@@ -31,6 +33,24 @@ Splits given loaded CSV into two tables at the first empty row.
 
 ### IO
 
+    (import util-io)
+
+Module implementing advanced I/O.
+
+    (read-lines/no-bom port)
+
+* ```port``` - an input port
+
+Reads lines using ```read-lines``` and if the first line contains
+UTF-8 BOM, removes it.
+
+    (get-process-output-lines cmd)
+
+* ```cmd``` - a string with the command
+
+Returns a list of strings representing all the lines produced by
+running the command given.
+
 ### List
 
     (import util-list)
@@ -72,6 +92,17 @@ remainder with leading whitespace removed.
 
 ### Tag
 
+    (import util-tag)
+
+A unifying module for compound data structures tagging.
+
+    (make-tag name)
+
+* ```name``` - unquoted symbol to base the tag on
+
+Creates a unique and collision free symbol to identify compound data
+structures based on lists and pairs.
+
 ### Time
 
     (import util-time)