Add instructions for Trust Wallet Beta for Android (#9261) (#9265)

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docs/src/wallet/trust-wallet.md

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 # Trust Wallet
+Trust Wallet is an app for your smartphone or tablet and is the fastest and
+simplest way for most users to get started with a Solana wallet.
 
-**NOTE: Trust Wallet currently only supports Solana on the iOS version of its
-app.  Support for Android is coming very very soon!**
+## Install Trust Wallet
 
-##Set Up Trust Wallet
- - Open the App Store or Play Store
+#### iOS
+ - Open the App Store
  - Download “Trust: Crypto & Bitcoin Wallet” from Six Days LLC
    - Requires iOS 13.0 or higher
-   - Requires Android 6.0 or higher
  - Open Trust Wallet and follow the app prompts to get started
 
+***
+
+#### Android
+
+**NOTE: At this time, Solana's SOL tokens are only supported in the Beta version
+of Trust Wallet for Android.  The following steps explain how to install this
+Beta version to start using your Solana wallet. Check back here or check the
+latest official Trust Wallet release notes for when support is added to their
+official Android release.**
+
+ - Open the Play Store
+ - Download the official version of Trust Wallet
+   - “Trust: Crypto & Bitcoin Wallet” from Six Days LLC
+   - Requires Android 6.0 or higher
+
+![Install the Official Version of Trust Wallet](../.gitbook/assets/install-official-trust-wallet.png)
+
+##### Enable Beta version of Trust Wallet
+ - Make sure you already have the official version installed
+ - Open Play Store and view Trust Wallet's app page
+ - Scroll down to the bottom to the "Beta" section and tap "Join"
+ - It may take a few minutes for your device to get access to the Beta version
+
+![Join the Beta program](../.gitbook/assets/join-beta-trust-wallet.png)
+
+##### Upgrade to the Beta version
+ - Open Play Store .
+ - Tap Menu --> My apps and games --> Beta.
+ - Tap Trust Wallet
+ - Tap Upgrade when brought back to the Trust Wallet (Beta) install page
+
+![Find Beta app you've joined](../.gitbook/assets/find-beta-apps.png)
+
+***
+
+![Upgrade to Trust Wallet Beta](../.gitbook/assets/update-trust-wallet-to-beta.png)
+
+##### Beta Install Support for Android
+ - [Google's Official Help for Installing Beta Versions of Apps](https://support.google.com/googleplay/answer/7003180?hl=en)
+
 ## Add Solana (SOL) tokens to your wallet
  - From the main page, go to the “Tokens” tab at the top of the screen
  - Tap the “+” icon at the top right corner