Add project information to README

Author: weavejester

README.md

@@ -1,10 +1,44 @@
 # Duct Shadow CLJS Compiler [![Build Status](https://github.com/duct-framework/compiler.cljs.shadow/actions/workflows/test.yml/badge.svg)](https://github.com/duct-framework/compiler.cljs.shadow/actions/workflows/test.yml)
 
-A Clojure library designed to ... well, that part is up to you.
+[Integrant][] methods for running [Shadow CLJS][]. Designed for
+the [Duct][] framework, but can be used in any Integrant configuration.
+
+This library is still very new and API may change.
+
+[duct]: https://github.com/duct-framework/duct
+[integrant]: https://github.com/weavejester/integrant
+[shadow cljs]: https://github.com/thheller/shadow-cljs
+
+## Installation
+
+Add the following dependency to your deps.edn file:
+
+    org.duct-framework/compiler.cljs.shadow {:mvn/version "0.1.0-SNAPSHOT"}
+
+Or to your Leiningen project file:
+
+    [org.duct-framework/compiler.cljs.shadow "0.1.0-SNAPSHOT"]
 
 ## Usage
 
-FIXME
+This library provides Integrant methods for two keys:
+
+- `:duct.compiler.cljs.shadow/release`
+- `:duct.compiler.cljs.shadow/server`
+
+Both take the same configuration, but have different applications. The
+'release' key generates production-ready ClojureScript, while the
+'server' key starts a Shadow CLJS development server.
+
+The options for both keys are the same as a `shadow-cljs.edn` file, with
+one notable exception; instead of a map of build configurations under
+the `:builds` option, there is a single build configuration under the
+`:build` key.
+
+For more information, see the documentation on [Shadow CLJS
+configuration][config].
+
+[config]: https://shadow-cljs.github.io/docs/UsersGuide.html#config
 
 ## License