Finish documenting ANSI and therefore all support modules.

README.md

@@ -85,6 +85,61 @@ implemented anyway to not require any external dependencies.
 
 ### ANSI
 
+A simple module for creating ANSI (ECMA-48) sequence strings.
+
+    (ansi . args)
+
+* ```args``` - a list of color/style keywords
+
+Produces an ANSI CSI (Control Sequence Introducer) SGR (Select Graphic
+Rendition) strings with given attributes (re)set.
+
+It understands the following keywords:
+
+* ```#:black``` - black text foreground color
+* ```#:red``` - red text foreground color
+* ```#:green``` - green text foreground color
+* ```#:yellow``` - yellow text foreground color
+* ```#:blue``` - blue text foreground color
+* ```#:magenta``` - magenta text foreground color
+* ```#:cyan``` - cyan text foreground color
+* ```#:white``` - white (grey) text foreground color
+* ```#:default``` - reset all attributes to terminal defaults
+* ```#:bold``` - bold font (and/or bright foreground color on some terminals)
+
+The order is important as the ```#:default``` resets all attributes
+given even in the same attribute list.
+
+    a:error
+
+Used to signal errors. Defaults to red bold text.
+
+    a:warning
+
+Used to signal non-fatal warnings. Defaults to regular yellow text.
+
+    a:success
+
+Signals success of an operation. Defaults to bold green text.
+
+    a:neutral
+
+Used for generic text. Defaults to regular white (grey) text.
+
+    a:default
+
+Special style which just resets the terminal output attributes to
+terminal defaults.
+
+    a:muted
+
+Used for displaying the text "muted" (dimmed). Defaults to bold/bright
+black text.
+
+    a:highlight
+
+Generic highlight of given text. Defaults to bold blue text.
+
 ### Command Line parsing
 
 Generic syntax-based implementation of command-line options parsing