Update README.md

README.md

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 # MikuMikuDanceQuickLook
 macOS QuickLook plugin for MikuMikuDance files
+
+![ScreenShot](https://github.com/magicien/MikuMikuDanceQuickLook/blob/master/screenshot.png)
+
+## System Requirements
+
+- macOS 10.13 (High Sierra) or later
+
+## Supported file formats
+
+- .pmd (Polygon Model Data)
+- .pmx (Polygon Model eXtended)
+- .x (DirectX File)
+
+## Install
+
+### Manually
+
+1. Download **MikuMikuDanceQuickLook_vX.X.X.zip** from [Releases](https://github.com/magicien/MikuMikuDanceQuickLook/releases/latest).
+2. Put **MikuMikuDanceQuickLook.qlgenerator** (in the zip file) into `/Library/QuickLook` (for all users) or `~/Library/QuickLook` (only for the logged-in user).
+3. Run `qlmanage -r` command to reload QuickLook plugins.
+
+## See also
+
+- [MMDSceneKit](https://github.com/magicien/MMDSceneKit/)