README: Update with description and methods

README.md

@@ -1,2 +1,38 @@
 # assert-extended
-Core assert library extended slightly with few more assertion methods
+A complimenting library for `require('assert')` with a few more assertions being made available.
+
+# Installation
+
+```
+npm install assert-extended --save-dev
+```
+
+# Usage
+
+Add the following anywhere in your test:
+
+```
+require('assert-extended');
+```
+
+And you're good to go.
+
+# Assert
+
+Including the default ones that come with `assert` the following are added:
+
+### assert.notOk(value, message)
+
+Asserts value is a falsy value.
+
+### assert.isFulfilled(promise, message)
+
+Asserts that the promise is fulfilled.
+
+### assert.isRejected(promise, message)
+
+Asserts that the promise is rejected.
+
+### assert.match(value, test, message)
+
+Asserts that the value RexExp matches the test.