📝 add README

README.md

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+<p align="right">
+  <img width="300" alt="Eastern" src="https://user-images.githubusercontent.com/1548478/44305426-d7365080-a3b1-11e8-9f7d-0ea817f15db0.png">
+</p>
+
+Eastern CLI
+---
+
+<p align="right">
+  <a href="https://www.npmjs.com/package/eastern-cli">
+    <img alt="Npm version" src="https://badge.fury.io/js/eastern-cli.svg">
+  </a>
+  <a href="https://travis-ci.org/59naga/eastern-cli">
+    <img alt="Build Status" src="https://travis-ci.org/59naga/eastern-cli.svg?branch=master">
+  </a>
+</p>
+
+Installation
+---
+
+```bash
+npm install eastern eastern-cli --save-dev
+# or
+yarn add -D eastern eastern-cli
+```
+
+The `eastern` command defines `global.spec`, `global.it`, `global.describe`.
+And find and run `test.mjs` / `test/**/*.mjs`.
+
+```bash
+eastern
+# 
+# 
+#   0 passing (5 ms)
+```
+
+[API](https://github.com/59naga/eastern#api)
+---
+
+License
+---
+MIT