Update README to include release links

# Thunderbird for Android

<a href="https://play.google.com/store/apps/details?id=net.thunderbird.android.beta&utm_source=thunderbird-android-github&utm_campaign=badge" target="_blank"><img alt="Get it on Google Play" src="https://www.mozilla.org/media/img/l10n/en-US/firefox/android/btn-google-play-high-res.87d9720bbc8b.png" height="28"></a>

[![Latest release](https://img.shields.io/github/release/thunderbird/thunderbird-android.svg?style=for-the-badge)](https://github.com/thunderbird/thunderbird-android/releases/latest)

[![Latest release](https://img.shields.io/github/release/thunderbird/thunderbird-android.svg?style=for-the-badge&filter=THUNDERBIRD_*&logo=thunderbird)](https://github.com/thunderbird/thunderbird-android/releases/latest)

[![Latest beta release](https://img.shields.io/github/v/release/thunderbird/thunderbird-android.svg?include_prereleases&style=for-the-badge&label=beta&filter=THUNDERBIRD_*&logo=thunderbird)](https://github.com/thunderbird/thunderbird-android/releases)

Thunderbird for Android is a powerful, privacy-focused email app. Effortlessly manage multiple email accounts from one app, with a Unified Inbox option for maximum productivity. Built on open-source technology and supported by a dedicated team of developers alongside a global community of volunteers, Thunderbird never treats your private data as a product.

Thunderbird for Android can be downloaded from a couple of sources:

- [Thunderbird Beta on Google Play](https://play.google.com/store/apps/details?id=net.thunderbird.android.beta&utm_source=thunderbird-android-github&utm_campaign=download-section)

- [Thunderbird on Google Play](https://play.google.com/store/apps/details?id=net.thunderbird.android&referrer=utm_campaign%3Dandroid_metadata%26utm_medium%3Dweb%26utm_source%3Dgithub.com%26utm_content%3Dlink)

- [Thunderbird Beta on Google Play](https://play.google.com/store/apps/details?id=net.thunderbird.android.beta&referrer=utm_campaign%3Dandroid_metadata%26utm_medium%3Dweb%26utm_source%3Dgithub.com%26utm_content%3Dlink)

- [Github Releases](https://github.com/thunderbird/thunderbird-android/releases)

- F-Droid coming soon

- FFUpdater coming soon

By using Thunderbird for Android Beta, you have early access to current development and are able to try new features earlier. The final release for Thunderbird [is coming soon](https://blog.thunderbird.net/2024/09/help-us-test-the-thunderbird-for-android-beta/)!

By using Thunderbird for Android Beta, you have early access to current development and are able to try new features earlier.

Check out the [Release Notes](https://github.com/thunderbird/thunderbird-android/releases) to find out what changed in each version of Thunderbird for Android.