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doc: add punycode.js documentation

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+# punycode
+
+ Stability: 2 - Unstable
+
+[Punycode.js](http://mths.be/punycode) is bundled with Node.js v0.6.2+. Use
+`require('punycode')` to access it. (To use it with other Node.js versions,
+use npm to install the `punycode` module first.)
+
+## punycode.decode(string)
+
+Converts a Punycode string of ASCII code points to a string of Unicode code
+points.
+
+ // decode domain name parts
+ punycode.decode('maana-pta'); // 'mañana'
+ punycode.decode('--dqo34k'); // '☃-⌘'
+
+## punycode.encode(string)
+
+Converts a string of Unicode code points to a Punycode string of ASCII code
+points.
+
+ // encode domain name parts
+ punycode.encode('mañana'); // 'maana-pta'
+ punycode.encode('☃-⌘'); // '--dqo34k'
+
+## punycode.toUnicode(domain)
+
+Converts a Punycode string representing a domain name to Unicode. Only the
+Punycoded parts of the domain name will be converted, i.e. it doesn't matter if
+you call it on a string that has already been converted to Unicode.
+
+ // decode domain names
+ punycode.toUnicode('xn--maana-pta.com'); // 'mañana.com'
+ punycode.toUnicode('xn----dqo34k.com'); // '☃-⌘.com'
+
+## punycode.toASCII(domain)
+
+Converts a Unicode string representing a domain name to Punycode. Only the
+non-ASCII parts of the domain name will be converted, i.e. it doesn't matter if
+you call it with a domain that's already in ASCII.
+
+ // encode domain names
+ punycode.toASCII('mañana.com'); // 'xn--maana-pta.com'
+ punycode.toASCII('☃-⌘.com'); // 'xn----dqo34k.com'
+
+## punycode.ucs2
+
+### punycode.ucs2.decode(string)
+
+Creates an array containing the decimal code points of each Unicode character
+in the string. While [JavaScript uses UCS-2
+internally](http://mathiasbynens.be/notes/javascript-encoding), this function
+will convert a pair of surrogate halves (each of which UCS-2 exposes as
+separate characters) into a single code point, matching UTF-16.
+
+ punycode.ucs2.decode('abc'); // [97, 98, 99]
+ // surrogate pair for U+1D306 tetragram for centre:
+ punycode.ucs2.decode('\uD834\uDF06'); // [0x1D306]
+
+### punycode.ucs2.encode(codePoints)
+
+Creates a string based on an array of decimal code points.
+
+ punycode.ucs2.encode([97, 98, 99]); // 'abc'
+ punycode.ucs2.encode([0x1D306]); // '\uD834\uDF06'
+
+## punycode.version
+
+A string representing the current Punycode.js version number.

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