Add in a bunch of details to the README.

.gitignore

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 node_modules
+test/date-styles.csv

README.md

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-node-yearrange
-==============
+# Node.js Year Range Parser
 
-Parse year range strings and convert to usable dates.
+A Node.js library for parsing year range strings and converting them into usable dates. This library is only designed to handle year ranges (all month/day information is discarded).
+
+Its usage is best explained through some examples:
+
+    var yr = require("yearrange");
+
+    yr.parse("1877")
+    // {"start": 1877, "end": 1877}
+
+    yr.parse("1847-48")
+    // {"start": 1847, "end": 1848}
+
+    yr.parse("ca. 1810-20s")
+    // {"start": 1810, "end": 1829, "circa": true}
+
+    yr.parse("18th–19th century")
+    // {"start": 1700, "end": 1899}
+
+    yr.parse("Meiji era")
+    // {"start": 1868, "end": 1912}
+
+Many more examples can be found in the `test/date-tests.json` file.
+
+This library was originally built for parsing dates from museums, universities, galleries, and dealers for [Ukiyo-e.org](http://ukiyo-e.org/) by [John Resig](http://ejohn.org/).
+
+## API
+
+In essence there is only a single generally-useful  method exposed:
+
+### `parse(dateString)`
+
+This method takes in a single argument: A string holding the year range. The method returns an object representing the date range.
+
+For example an object after calling `parse("1877")` might look like:
+
+    {"original":"1877","start":1877,"end":1877}
+
+If no valid date is matched by the parser then `undefined` is returned instead.
+
+## License
+
+The library is released under an MIT license.