update readme

Author: autumn-mck

README.md

@@ -1 +1,12 @@
-online version of [datapack toolkit](https://github.com/everloste/DatapackToolkit).
+![Datapack toolkit](./public/title-export.png)
+
+Datapack Toolkit is an easy-to-use Minecraft worldgen datapack configuration tool.
+
+This version is early in development, and currently only supports custom datapack configuration screens.
+
+Also planned to support:
+
+- Picking biome definition providers from a set of packs
+- Editing structure set placement
+
+This web version replaces the previous [datapack toolkit](https://github.com/everloste/DatapackToolkit).