Create readme.md

readme.md

+本项目基于[uni-app框架](https://uniapp.dcloud.net.cn/)
+
+前置工作: (所需环境：node.js)
+```bash
+    npm install
+```
+
+开发环境运行:
+```bash
+    npm run dev:h5
+```
+
+编译h5:
+```bash
+    npm run build:h5
+```
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