add example/api/license sections to the README file

Author: kdzwinel

.editorconfig

@@ -6,3 +6,4 @@ insert_final_newline = true
 charset = utf-8
 indent_style = space
 indent_size = 2
+

.travis.yml

@@ -1,3 +1,4 @@
 language: node_js
 node_js:
 - '0.12'
+

README.md

@@ -1 +1,53 @@
 # nodejs-onesky-utils [![Build Status](https://travis-ci.org/brainly/nodejs-onesky-utils.svg?branch=master)](https://travis-ci.org/brainly/nodejs-onesky-utils) [![Code Climate](https://codeclimate.com/github/brainly/nodejs-onesky-utils/badges/gpa.svg)](https://codeclimate.com/github/brainly/nodejs-onesky-utils)
+NodeJS utils for working with [OneSky](http://www.oneskyapp.com/) translation service.
+
+## Example
+
+```
+var onesky = require("onesky-utils");
+
+var options = {
+  language: "en_EN",
+  secret: “1234567",
+  apiKey: “abcdefg",
+  projectId: “123",
+  fileName: “translations.po"
+};
+
+onesky.getFile(options).then(function(content) {
+  console.log(content);
+}).catch(function(error) {
+  console.log(error);
+});
+```
+
+## Install
+
+```
+$ npm install onesky-utils
+````
+
+## API
+
+### getFile(options)
+Downloads translation file from OneSky.
+
+Returns file content via promise.
+
+The `options` object is required. Options include:
+
+- **options.projectId** - numerical ID of the project
+- **options.fileName** - name of the translation file
+- **options.language** - language version
+- **options.secret** - secret and apiKey are used for authentication
+- **options.apiKey**
+
+## Tests
+
+```
+$ npm test
+````
+
+## License
+
+[MIT](./LICENSE)