Merge pull request #704 from yubozhao/doc-translation

Add basic English doc for install

docs/install_en.md

@@ -0,0 +1,59 @@
+## Using npm to install
+
+**We recommend use npm to install**，Not only it makes development easier，also you can take advantage of the whole ecosystem.
+
+
+If using npm to install, you could use `import` or `require`.
+
+Stable version <span class="versions" id="stable-version"></span>：
+
+[![npm package](http://img.shields.io/npm/v/antd.svg?style=flat-square)](https://www.npmjs.org/package/antd)
+
+```bash
+$ npm install antd --save
+```
+
+Beta version <span class="versions" id="latest-version"></span>：
+
+[![](https://cnpmjs.org/badge/v/antd.svg?&tag=beta&subject=npm)](https://www.npmjs.org/package/antd)
+
+```bash
+$ npm install antd@beta --save
+```
+
+> **Past releases**：https://github.com/ant-design/ant-design/releases
+
+
+## Development tool 
+
+We provide React components [Scaffold tool](https://github.com/ant-design/antd-init).
+
+```bash
+$ npm install antd-init -g
+```
+
+Inside an empty folder run `antd-init` to init.
+
+> [More tools](https://github.com/ant-tool/xtool/)。
+
+<style>
+.versions {
+  font-weight: bold;
+  color: #C05B4D;
+  font-family: Consolas;
+  margin-left: 0.3em;
+  background: #FFF1E7;
+  padding: 2px 5px;
+  border-radius: 3px;
+}
+</style>
+
+<script>
+$('#latest-version').html(antdVersion.latest);
+
+if (antdVersion.stable) {
+  $('#stable-version').html(antdVersion.stable);
+} else {
+  $('#stable-version').html('not available');
+}
+</script>