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.

txclient/public/.well-known/assetlinks.json

@@ -0,0 +1,14 @@
+[
+  {
+    "relation": [
+      "delegate_permission/common.handle_all_urls"
+    ],
+    "target": {
+      "namespace": "android_app",
+      "package_name": "com.hdrdevs.turnosxpress",
+      "sha256_cert_fingerprints": [
+        "CE:15:98:AB:BE:28:AF:CB:DA:85:97:76:DD:35:B3:94:48:90:3E:3C:5A:AD:A5:CD:73:EF:DC:EC:C4:CC:5F:A3"
+      ]
+    }
+  }
+]