added readme

readme.md

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+# foreach-async
+
+Array forEach which handles asynchronous operations in Node and the browser (using Browserify, etc.)
+
+install:
+
+```sh
+$ npm i foreach-async
+```
+
+Usage:
+```javascript
+var forEach = require('foreach-async')
+
+forEach(['a', 'b', 'c'], function (value, index, array) {
+
+  // do something async
+  something.async(function () {
+    // signify done, passing optional result
+    this.done(*result*)
+  }.bind(this))
+
+}, function (results) {
+  // called after all array items have been
+  // iterated, all values passed to done
+  // are accessible in the 'results' array
+})
+
+```