Update README.md

Author: romannurik

README.md

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-Android Asset Studio
-====================
+[![No Maintenance Intended](http://unmaintained.tech/badge.svg)](http://unmaintained.tech/)
 
-**[Open the Android Asset Studio](https://romannurik.github.io/AndroidAssetStudio/)**
+# The Android Asset Studio is no longer maintained. Please use [icon.kitchen](https://icon.kitchen) or the asset creation tools built into Android Studio
+
+Legacy link: **[Open the Android Asset Studio](https://romannurik.github.io/AndroidAssetStudio/)**
 
 A web-based set of tools for generating graphics and other assets that would eventually be in an Android application's res/ directory.