Update README (#646)

Author: mickael-menu

README.md

@@ -2,11 +2,86 @@
 
 [Readium Mobile](https://github.com/readium/mobile) is a toolkit for ebooks, audiobooks and comics written in Swift & Kotlin.
 
-:point_up: **Take a look at the [guide to get started](docs/guides/getting-started.md).** A [Test App](test-app) demonstrates how to integrate the Readium Kotlin toolkit in your own reading app.
+:point_up: **Take a look at the [guide to quickly get started](docs/guides/getting-started.md).** A [Test App](test-app) demonstrates how to integrate the Readium Kotlin toolkit in your own reading app.
 
 :question: **Find documentation and API reference at [readium.org/kotlin-toolkit](https://readium.org/kotlin-toolkit)**.
 
-## Minimum Requirements
+## Features
+
+✅ Implemented      🚧 Partially implemented       📆 Planned      👀 Want to do      ❓ Not planned
+
+### Formats
+
+| Format | Status |
+|---|:---:|
+| EPUB 2 | ✅ |
+| EPUB 3 | ✅ |
+| Readium Web Publication | 🚧 |
+| PDF | ✅ |
+| Readium Audiobook | ✅ |
+| Zipped Audiobook | ✅ |
+| Standalone audio files (MP3, AAC, etc.) | ✅ |
+| Readium Divina | 🚧 |
+| CBZ (Comic Book ZIP) | 🚧 |
+| CBR (Comic Book RAR) | ❓ |
+| [DAISY](https://daisy.org/activities/standards/daisy/) | 👀 |
+
+### Features
+
+A number of features are implemented only for some publication formats.
+
+| Feature | EPUB (reflow) | EPUB (FXL) | PDF |
+|---|:---:|:---:|:---:|
+| Pagination | ✅ | ✅ | ✅ |
+| Scrolling | ✅ | 👀 | ✅ |
+| Right-to-left (RTL) | ✅ | ✅ |  ✅ |
+| Search in textual content | ✅ | ✅ | 👀 |
+| Highlighting (Decoration API) | ✅ | ✅ | 👀 |
+| Text-to-speech (TTS) | ✅ | ✅ | 👀 |
+| Media overlays | 📆 | 📆 | |
+
+### OPDS Support
+
+| Feature | Status |
+|---|:---:|
+| [OPDS Catalog 1.2](https://specs.opds.io/opds-1.2) | ✅ | 
+| [OPDS Catalog 2.0](https://drafts.opds.io/opds-2.0) | ✅ | 
+| [Authentication for OPDS](https://drafts.opds.io/authentication-for-opds-1.0.html) | 📆 |
+| [Readium LCP Automatic Key Retrieval](https://readium.org/lcp-specs/notes/lcp-key-retrieval.html) | 📆 |
+
+### DRM Support
+
+| Feature | Status |
+|---|:---:|
+| [Readium LCP](https://www.edrlab.org/projects/readium-lcp/) | ✅ |
+| [Adobe ACS](https://www.adobe.com/fr/solutions/ebook/content-server.html) | ❓ |
+
+## User Guides
+
+Guides are available to help you make the most of the toolkit.
+
+### Publication
+
+* [Opening a publication](docs/guides/open-publication.md) – parse a publication package (EPUB, PDF, etc.) or manifest (RWPM) into Readium `Publication` models
+* [Extracting the content of a publication](docs/guides/content.md) – API to extract the text content of a publication for searching or indexing it
+* [Supporting PDF documents](docs/guides/pdf.md) – setup the PDF support in the toolkit
+* [Text-to-speech](docs/guides/tts.md) – read aloud the content of a textual publication using speech synthesis
+* [Accessibility](docs/guides/accessibility.md) – inspect and present accessibility metadata to users
+
+### Navigator
+
+* [Navigator](docs/guides/navigator/navigator.md) - an overview of the Navigator to render a `Publication`'s content to the user
+* [Configuring the Navigator](docs/guides/navigator/preferences.md) – setup and render Navigator user preferences (font size, colors, etc.)
+* [Font families in the EPUB navigator](docs/guides/navigator/epub-fonts.md) – support custom font families with reflowable EPUB publications
+* [Media Navigator](docs/guides/navigator/media-navigator.md) – use the Media Navigator to read aloud a publication (audiobook, TTS, etc.)
+
+### DRM
+
+* [Supporting Readium LCP](docs/guides/lcp.md) – open and render LCP DRM protected publications
+
+## Setting up the Readium Kotlin toolkit
+
+### Minimum Requirements
 
 | Readium   | Android min SDK | Android compile SDK | Kotlin compiler (✻) | Gradle (✻) |
 |-----------|-----------------|---------------------|---------------------|------------|
@@ -16,7 +91,7 @@
 
 ✻ Only required if you integrate Readium as a submodule instead of using Maven Central.
 
-## Setting Up Readium
+### Dependencies
 
 Readium modules are distributed with [Maven Central](https://search.maven.org/search?q=g:org.readium.kotlin-toolkit). Make sure that you have the `$readium_version` property set in your root `build.gradle`, then add the Maven Central repository.
 
@@ -46,7 +121,7 @@ dependencies {
 
 :warning: If you target Android devices running below API 26, you must enable [core library desugaring](https://developer.android.com/studio/write/java8-support#library-desugaring) in your application module.
 
-### Using a local Git clone
+#### Using a local Git clone
 
 You may prefer to use a local Git clone if you want to contribute to Readium, or if you are using your own fork.