Add README

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+#+title: matrix-dendrite-admin
+
+Simple administration commandline application for the Dendrite server.
+
+* To use
+Install with cargo as usual. Place an .env file in the working directory and fill out the following variables (KEY=VALUE):
+  - ACCESS_TOKEN - Your account's access token, which can be found in Settings -> Help & About -> Advanced -> Access Token
+  - INSTANCE_URL - full URL to your instance (this may be removed eventually)
+  - INSTANCE_DOMAIN - the domain used for user accounts (after the colon).
+
+You may instead supply ACCESS_TOKEN as a normal environment variable if you don't want to store that information on disk.
+
+You can now run the application and change someone's password by following the prompts.
+
+* Achieved
+** Basic password reset endpoint
+
+* Goals
+** TODO whois query on a user
+** TODO Resolve instance redirection automatically
+** TODO TUI interface
+** TODO Refresh devices
+** TODO Evacuating a room
+** TODO Evacuating a user from all rooms
+** TODO Reindexing fulltext search
+** TODO Purging a room