chore (repo): Add README.md for mesh_service_example

mesh_service_example/README.md

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+# mesh_service_example
+
+This module provides an example implementation of an app that uses the [AIDL](https://developer.android.com/develop/background-work/services/aidl) Mesh Service provided by Meshtastic-Android project.
+
+## Overview
+
+The [AIDL](../app/src/main/aidl/com/geeksville/mesh/IMeshService.aidl) is defined in the main app module and is used to interact with the mesh network.
+
+`mesh_service_example` demonstrates how to build and integrate a custom mesh service within the Meshtastic ecosystem. It is intended as a reference for developers who want to extend or customize mesh-related functionality.
+
+## Features
+- Example service structure for mesh integration
+- Sample code for service registration and communication
+
+## Usage
+1. Clone the Meshtastic-Android repository.
+2. Open the project in Android Studio.
+3. Explore the `mesh_service_example` module source code under `mesh_service_example/src/`.
+4. Use this module as a template for your own mesh service implementations.
+
+## Development
+- To build the module, use the standard Gradle build commands:
+  ```sh
+  ./gradlew :mesh_service_example:build
+  ```
+- To run tests for this module:
+  ```sh
+  ./gradlew :mesh_service_example:test
+  ```
+
+## License
+This example module is provided under the same license as the main Meshtastic-Android project. See the root `LICENSE` file for details.
+