Added a README

README.md

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+# homeassistant-mpris-bridge-rust
+
+## Introduction
+
+Linux application to handle control of Home Assistant media players.
+A rewrite of the very nice ![repository by rytilahti](https://github.com/rytilahti/homeassistant-mpris-bridge).
+If you want it to be fully featured, use that one instead.
+This will eventually have feature parity, but it is not there yet.
+
+## Installation
+
+No instructions available right now beyond `git clone` this repository, then `cargo run`. 
+
+## Configuration
+
+Configuration is stored in `~/.config/ha_mpris_bridge/config.toml`. 
+This file is created if it does not exist the first time you run the bridge. 
+It will also error the first time you run it, as the placeholder values are wrong.
+Yes, I will fix the error so it at least exits nicely and explains what happened and how to fix it.
+
+## Missing features
+
+- It currently does not handle volume
+- Position seeking seems buggy. Uncertain if that's on me, or on MPRIS 
+