Update README

README.md

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-# PixelaUI-App
-PixelaUI documentations
+[PixelaUI](https://apps.apple.com/us/app/pixelaui/id1495611090) documentations.
+
+## About PixelaUI
+
+PixelaUI is a client application of [Pixela](https://pixe.la).  
+
+With Pixela, you can get a graph that expresses the degree of your daily various activities on a basis with a vivid gradation.  
+PixelaUI can perform many Pixela actions intuitively.  
+
+<a href="https://apps.apple.com/us/app/pixelaui/id1495611090?itsct=apps_box&amp;itscg=30200" style="display: inline-block; overflow: hidden; border-top-left-radius: 13px; border-top-right-radius: 13px; border-bottom-right-radius: 13px; border-bottom-left-radius: 13px; width: 250px; height: 83px;"><img src="https://tools.applemediaservices.com/api/badges/download-on-the-app-store/black/en-US?size=250x83&amp;releaseDate=1579651200&h=1e4303cda42322cbdb5308477b42baba" alt="Download on the App Store" style="border-top-left-radius: 13px; border-top-right-radius: 13px; border-bottom-right-radius: 13px; border-bottom-left-radius: 13px; width: 250px; height: 83px;"></a>
+
+- [Privacy Policy](https://github.com/yutailang0119/PixelaUI-App/wiki/Privacy-Policy)
+- [Support](https://github.com/yutailang0119/PixelaUI-App/wiki/Support)
+