Add initial README

Fixes: 213385438

Change-Id: I0ba0511eb76814b0a8ce8134d8eb32d3081e2d91

README.md

@@ -1,18 +1,66 @@
-Now in Android App
+Now in Android App [WIP]
 ==================
-This is the repo for the Now in Android app. 
 
-TODOs:
+This is the repository for the [Now in Android](https://developer.android.com/series/now-in-android)
-- Add note about version catalogs for dependencies
+app.
 
-## Baseline profile
+Now in Android is a fully functional Android app built entirely with Kotlin and Jetpack Compose. It
+follows Android design and development best practices and is intended to be a useful reference
+for developers. As a running app, it's intended to help developers keep up-to-date with the world
+of Android development by providing regular news updates.
+
+# Features
+
+Now in Android displays content from the
+[Now in Android](https://developer.android.com/series/now-in-android) series. Users can browse for
+links to recent videos, articles and other content. Users can also follow topics they are interested
+in or follow specific authors.
+
+<!-- TODO: Add screenshots -->
+
+# Development Environment
+
+Now in Android uses the Gradle build system and can be imported directly into the latest stable
+version of Android Studio (available [here](https://developer.android.com/studio)). The `debug`
+build can be built and run using the default configuration.
+
+Once you're up and running, you can refer to the learning journeys below to get a better
+understanding of which libraries and tools are being used, the reasoning behind the approaches to
+UI, testing, architecture and more, and how all of these different pieces of the project fit
+together to create a complete app.
+
+<!--
+# Architecture
+
+TODO (brief overview, link to another doc?)
+
+# Build
+
+TODO (brief overview, link to another doc?
+
+# Testing + CI
+
+TODO (brief overview, link to another doc?)
+
+# UI
+
+TODO (brief overview, link to another doc?)
+-->
+
+# Baseline profiles
 
 The baseline profile for this app is located at `app/src/main/baseline-prof.txt`.
 It contains rules that enable AOT compilation of the critical user path taken during app launch.
 For more information on baseline profiles, read [this document](https://developer.android.com/studio/profile/baselineprofiles).
 
-| Note: The baseline profile needs to be re-generated for release builds that touched code which changes app startup.
+| Note: The baseline profile needs to be re-generated for release builds that touched code which
+| changes app startup.
 
 To generate the baseline profile, select the `benchmark` build variant and run the
 `BaselineProfileGenerator` benchmark test on an AOSP Android Emulator.
-Then copy the resulting baseline profile from the emulator to `app/src/main/baseline-prof.txt`.
+Then copy the resulting baseline profile from the emulator to `app/src/main/baseline-prof.txt`.
+
+# License
+
+Now in Android is distributed under the terms of the Apache License (Version 2.0). See the
+[license](LICENSE) for more information.