update README

README.md

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+<p align="center">
+  <img src="https://mupdf.com/app-assets/images/footer/mupdf_footer_logo.svg" alt="MuPDF Logo" width="320">
+</p>
+
+<p align="center">
+  <strong>A lightweight, high-performance PDF, XPS, and eBook engine.</strong>
+</p>
+
+---
+
+## 📱 Mobile Version
+
+Get the official MuPDF viewer for your Android device. Fast, private, and open-source.
+
+<p align="left">
+  <a href="https://play.google.com/store/apps/details?id=com.artifex.mupdf.viewer.app">
+    <img src="https://play.google.com/intl/en_us/badges/static/images/badges/en_badge_web_generic.png" alt="Get it on Google Play" height="60">
+  </a>
+  <a href="https://f-droid.org/packages/com.artifex.mupdf.viewer.app/">
+    <img src="https://fdroid.gitlab.io/artwork/badge/get-it-on.png" alt="Get it on F-Droid" height="60">
+  </a>
+</p>
+
+> **Direct APK:** You can also download the latest standalone APKs from our [Official Releases Page](https://mupdf.com/releases?product=MuPDF).
+
+---
+
+## ABOUT
+
+MuPDF is a lightweight open source software framework for viewing and converting
+PDF, XPS, and E-book documents.
+
+### See the documentation in
+
+ https://mupdf.readthedocs.io/en/latest/
+
+### Build instructions can be found in
+
+ https://mupdf.readthedocs.io/en/latest/guide/install.html
+
+---
+
+## LICENSE
+
+MuPDF is Copyright (c) 2006-2023 Artifex Software, Inc.
+
+This program is free software: you can redistribute it and/or modify it under
+the terms of the GNU Affero General Public License as published by the Free
+Software Foundation, either version 3 of the License, or (at your option) any
+later version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License along
+with this program. If not, see <http://www.gnu.org/licenses/>.
+
+For commercial licensing, including our "Indie Dev" friendly options,
+please contact <sales@artifex.com>.
+
+---
+
+## REPORTING BUGS AND PROBLEMS
+
+### The MuPDF developers hang out on Discord here
+
+ https://discord.gg/taPnFQp5gb
+
+## Report bugs on the ghostscript bugzilla, with MuPDF as the selected component
+
+ http://bugs.ghostscript.com/
+
+If you are reporting a problem with a specific file, please include the file as
+an attachment.
+
+<p align="center"> <sub>Google Play and the Google Play logo are trademarks of Google LLC.</sub> </p>
+
+---