Flexa adoption documentation (#1696)

docs/Auto Backup.md

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+# Android Auto Backup
+
+- The Zashi app uses the Android Auto Backup feature to back up the encrypted address book file securely on the 
+  user's Google Drive cloud  
+
+## Android Auto Backup testing
+
+To force the system Android backup logic for testing use the following ADB commands:
+```
+adb shell bmgr enable true
+adb shell bmgr backupnow co.electriccoin.zcash.debug
+```

docs/README.md

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-# Documentation
-
-# Android auto backup testing
-
-To force the android system back up the app use the following commands:
-```
-    adb shell bmgr enable true
-    adb shell bmgr backupnow co.electriccoin.zcash.debug
-```

docs/integrations/Flexa.md

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+# Flexa Integration
+- Flexa is a digital payment platform that allows merchants to accept various digital assets, including 
+  cryptocurrencies, as payment. It provides a seamless and secure way for users to pay with their digital wallets at 
+  physical stores.
+- The Android Flexa libraries are available on the [GitHub repository](https://github.com/flexa/flexa-android)
+- The Android Flexa libraries are currently distributed by [GitHub Releases](https://github.com/flexa/flexa-android/releases). 
+
+# Setup
+To bump the Flexa libraries use the following steps:
+1. Visit the Flexa GitHub Releases [page](https://github.com/flexa/flexa-android/releases)
+1. Download Core and Spent `.aar`(s)
+1. Put them into the related folders on path `/maven/com/flexa/`
+1. Update the `maven-metadata-local.xml` files to the given new version
+1. Update the `.pom`(s) files to the given new version
+1. Update `gradle.properties#FLEXA_VERSION` to point the given version