Add Gradle wrapper and configuration files for Android project

- Created gradle-wrapper.properties to specify Gradle distribution details.
- Added gradlew and gradlew.bat scripts for executing Gradle tasks.
- Introduced settings.gradle for project configuration and dependency management.
- Added assetlinks.json for Android App Links support.

tx-android/app/src/main/res/drawable/ic_launcher.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="@color/launcher_background"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="@color/launcher_foreground"
+        android:pathData="M24,24h60v12h-24v48h-12v-48h-24z" />
+    <path
+        android:fillColor="@color/launcher_foreground"
+        android:pathData="M30,72h48v12h-48z" />
+</vector>