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spinner/README.md

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+# Spinner
+Spinner is a development tool that lets you inspect and run queries against an app's database(s) in a convenient web interface.
+
+## Getting Started
+Install one of the spinner build variants (e.g. `./gradlew installPlayProdSpinner`) and run the following adb command:
+
+```bash
+adb forward tcp:5000 tcp:5000
+```
+
+Then, navigate to `localhost:5000` in your web browser.
+
+Magic!
+
+## How does it work?
+Spinner is just a [NanoHttpd](https://github.com/NanoHttpd/nanohttpd) server that runs a little webapp in the background. 
+You initialize Spinner in `Application.onCreate` with a list of databases you wish to let it run queries against.
+Then, you can use the `adb forward` command to route the Android device's port to a port on your local machine.
+
+## What's with the name?
+It's a riff on Flipper, a development tool we used to use. It was very useful, but also wildly unstable (at least on Linux).