Add screenshot

[ci skip]
qiuxiang · May 3, 2018 · 0a6e6db · 0a6e6db
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diff --git a/readme.md b/readme.md
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 React Native 高德地图定位模块，支持 Android + iOS。
 
+<img src="https://user-images.githubusercontent.com/1709072/39578441-c39bd3f0-4f16-11e8-83e5-99badbd68473.png" width=300>
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 ## 使用
 
 1. [安装](docs/installation.md)