docs(project): add prebuilt .whl (#21)

Co-authored-by: MegEngine <[email protected]>

Author: tpoisonooo

README.md

@@ -14,6 +14,7 @@ MegFlow 提供快速视觉应用落地流程，最快 15 分钟搭建起视频
 
 ## HowTo
 * how to build and run
+  * [run in 15 minutes](docs/how-to-build-and-run/run-in-15-minutes.zh.md)
   * [build with docker](docs/how-to-build-and-run/build-with-docker.zh.md)
   * [build from source](docs/how-to-build-and-run/build-from-source.zh.md)
   * [build on win10](docs/how-to-build-and-run/build-on-win10.zh.md)

docs/how-to-build-and-run/run-in-15-minutes.zh.md

@@ -24,7 +24,7 @@ $ conda activate py38
 
 ## 安装 Prebuilt 包
 
-下载对应 python 版本的 .whl 包，安装
+打开 [release 页面](https://github.com/MegEngine/MegFlow/releases)下载对应 python 版本的 .whl 包，安装
 ```bash
 $  python3 -m pip install megflow-0.1.0-py38-none-linux_x86_64.whl  --force-reinstall
 ```