add more info about testing and where tests live

Author: daviddias

README.md

@@ -20,6 +20,7 @@
   - [In the Browser through `<script>` tag](#in-the-browser-through-script-tag)
   - [CORS](#cors)
 - [Usage](#usage)
+  - [API](#api)
   - [Callbacks and promises](#callbacks-and-promises)
 - [Contribute](#contribute)
 - [License](#license)
@@ -99,7 +100,29 @@ $ ipfs config --json API.HTTPHeaders.Access-Control-Allow-Origin "[\"http://exam
 
 ## Usage
 
-See [API.md](API.md) and [`tests/api`](test/api) for details on available methods.
+### API
+
+> `WIP`
+
+`js-ipfs-api` follows the spec defined by [`interface-ipfs-core`](https://github.com/ipfs/interface-ipfs-core), which governs the interface to expect from IPFS implementations. This interface is an current active endeavour, expect it to be complete in the following weeks (August 2016). You can use it today to consult the methods available.
+
+### Extra API methods
+
+Adding to the methods defined by [`interface-ipfs-core`](https://github.com/ipfs/interface-ipfs-core), `js-ipfs-api` exposes a set of extra utility methods.
+
+A complete documentation for these methods is coming with: https://github.com/ipfs/js-ipfs-api/pull/305
+
+#### `ipfs.util.addURL`
+
+`...`
+
+#### `ipfs.util.addFiles`
+
+`...`
+
+### `ipfs.util.addStream`
+
+`...`
 
 ### Callbacks and promises
 
@@ -118,13 +141,19 @@ ipfs.id()
 This relies on a global `Promise` object. If you are in an environment where that is not
 yet available you need to bring your own polyfill.
 
+## Development
+
+### Testing
+
+We run tests by executing `npm test` in a terminal window, this will run both Node.js and Browser tests, both in Chrome and PhantomJS. To ensure that the module conforms with [`interface-ipfs-core`](https://github.com/ipfs/interface-ipfs-core) spec, we run the batch o tests provided by the interface module, which can be found [here](https://github.com/ipfs/interface-ipfs-core/tree/master/src)
+
 ## Contribute
 
 The js-ipfs API is a work in progress. As such, there's a few things you can do right now to help out:
 
 * **[Check out the existing issues](https://github.com/ipfs/js-ipfs-api/issues)**!
 * **Perform code reviews**. More eyes will help a) speed the project along b) ensure quality and c) reduce possible future bugs.
-* **Add tests**. There can never be enough tests.
+* **Add tests**. There can never be enough tests. Note that interface tests exist inside [`interface-ipfs-core`](https://github.com/ipfs/interface-ipfs-core/tree/master/src)
 * **Contribute to the [FAQ repository](https://github.com/ipfs/faq/issues)** with any questions you have about IPFS or any of the relevant technology. A good example would be asking, 'What is a merkledag tree?'. If you don't know a term, odds are, someone else doesn't either. Eventually, we should have a good understanding of where we need to improve communications and teaching together to make IPFS and IPN better.
 
 **Want to hack on IPFS?**