Add simple Antora docs.

Author: ajoberstar

docs/antora.yml

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+name: clojurephant-tooling
+version: true
+nav:
+  - modules/ROOT/nav.adoc
+asciidoc:
+  attributes:
+    clojurephant-version: "0.7.0"
+    clojurephant-tooling-version: "x.y.z"

docs/modules/ROOT/nav.adoc

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+* xref:index.adoc[]
+* link:https://cljdoc.org/d/dev.clojurephant/clojurephant-tooling/CURRENT[API Reference]

docs/modules/ROOT/pages/index.adoc

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+= Introduction
+
+The Clojurephant Tooling API (link:https://github.com/clojurephant/clojurephant-tooling[GitHub Repo]) is a sibling project to link:https://github.com/clojurephant/clojurephant[Clojurephant], the Gradle plugin providing support for Clojure and ClojureScript builds.
+
+This library is meant for use from a Clojure REPL to interact with a Gradle project using Clojurephant.
+
+CAUTION: The features and API should not be considered stable until 1.0.0.
+
+== Features
+
+* General Clojure wrapper for link:https://docs.gradle.org/current/userguide/third_party_integration.html[Gradle's Tooling API]
+* Access to Clojurephant's Gradle configuration from the REPL
+* Compile ClojureScript builds (including in watch mode)
+* Start ClojureScript REPLs based on:
+** Figwheel Main - with full hot code reloading
+** Figwheel REPL - for a more tranditional workflow, evaluating forms
+
+== API Documentation
+
+See API reference on link:https://cljdoc.org/d/dev.clojurephant/clojurephant-tooling/CURRENT[cljdoc].