Add docs

Author: TrySound

readme.md

@@ -1,28 +1,21 @@
 postcss-icss
 ============
 
-A CSS Modules parser to extract tokens from the css file. Provides opportunity to process multiple files. Supports both synchronous and asynchronous file loaders.
+A CSS Modules parser to extract tokens from the css file. Provides opportunity to process multiple files.
 
 ## API
 
-In order to use it you should provide a `fetch` function which should load contents of files and process it with the PostCSS instance. `fetch` function should return tokens or promise object which will resolve into tokens.
+In order to use it you should provide a `fetch` function which should load contents of files and process it with the PostCSS instance.
+`fetch` function should return  promise object which will resolve into tokens.
 
-```javascript
-var Parser = require('postcss-modules-parser');
+```js
+const ICSS = require('postcss-icss');
 
-/**
- * @param  {string} to   Path to the new file. Could be any.
- * @param  {string} from Path to the source file. Should be absolute.
- * @return {object}      Tokens
- */
-function fetch(to, from) {
+function fetch(importee, importerDir, processor) {
   // load content
-  return instance.process(css, {from: filename}).root.tokens;
+  return processor.process(css, { from: filename })
+    .then(result => result.messages.find(d => d.type === "icss").exportTokens);
 }
 
-new Parser({fetch: fetch});
+postcss([ ICSS({ fetch }) ]);
 ```
-
-See the examples:
-- asynchronous loader: [test/helper/async-loader.js](https://github.com/css-modules/postcss-modules-parser/blob/master/test/helper/async-loader.js)
-- synchronous loader: [test/helper/sync-loader.js](https://github.com/css-modules/postcss-modules-parser/blob/master/test/helper/sync-loader.js)