chore: Update README

* add shields badges for license, nightly build passing and store download numbers

Signed-off-by: eXhumer <[email protected]>

README.md

@@ -1,4 +1,9 @@
 # Controller Tools
+[![Nightly Action Status](https://img.shields.io/github/actions/workflow/status/jfernandez/ControllerTools/dev-build.yml?label=nightly%20build)](https://nightly.link/jfernandez/ControllerTools/workflows/dev-build/main/Controller%20Tools.zip)
+![Release Store Downloads](https://img.shields.io/badge/dynamic/json?url=https%3A%2F%2Fplugins.deckbrew.xyz%2Fplugins%3Fquery%3DController%2520Tools&query=%24%5B%3A1%5D.downloads&suffix=%20installs&label=decky%20store)
+![Testing Store Downloads](https://img.shields.io/badge/dynamic/json?url=https%3A%2F%2Ftesting.deckbrew.xyz%2Fplugins%3Fquery%3DController%2520Tools&query=%24%5B%3A1%5D.downloads&suffix=%20installs&label=testing%20store)
+[![License: GPL 3.0](https://img.shields.io/github/license/jfernandez/ControllerTools)](./LICENSE)
+
 ![plugin_demo](./assets/decky-loader-store-cover.png)
 
 Steam Deck game controller plugin for [Decky Loader](https://github.com/SteamDeckHomebrew/decky-loader). Displays the connection type (Bluetooth, USB), current battery %, and charging status.