updated readme

README.md

@@ -1,4 +1,47 @@
 prove
 =====
 
-Validation sugar with is
+Validation sugar with is-it
+
+Installation
+------------
+
+```bash
+npm install prove
+```
+
+Usage
+-----
+
+```javascript
+var prove = require('prove')
+
+if (var errs = prove(5).is('integer greaterThan(0)').errors) {
+  // not valid
+}
+```
+
+prove can also be chained:
+
+```javascript
+prove('foo').is('string').isnt('integer').errors
+```
+
+API
+---
+
+### prove(value)
+
+Returns a chainable object with `is`, `isnt` and `errors`.
+
+### .is(conditions)
+
+Runs the listed conditions against the value provided in `prove`.
+
+### .isnt(conditions)
+
+Runs the conditions against the value provided in `prove` but negated.
+
+### .errors
+
+This property contains an array of invalid conditions, or `null`.