update README.md with Android setup instructions

README.md

@@ -2,21 +2,70 @@
 
 >  **Disclaimer**
 >
-> This repository contains a proof-of-concept React Native plugin and an example mobile application intended solely for technical evaluation. 
+> This repository contains a proof-of-concept React Native plugin and an example mobile application intended solely for technical evaluation.
 >
 > Only the iOS integration has been verified to work at this time.
 > The Android bridge and Android example setup exist but have not been tested and are expected to require additional adjustments before they can be considered functional.
 >
-> This repository is **experimental**, **not formally approved**, **not officially released**, **not published as an npm package**, and **not endorsed by WebID for 
+> This repository is **experimental**, **not formally approved**, **not officially released**, **not published as an npm package**, and **not endorsed by WebID for
 > production use**.
 >
-> The setup described below includes non-standard workarounds and temporary configuration adjustments that are required due to current 
+> The setup described below includes non-standard workarounds and temporary configuration adjustments that are required due to current
 > tooling and dependency constraints.
 
 ---
 
 # Android
-_Android instructions will be added in a future commit._
+## Prerequisites
+- React Native version must be compatible with Kotlin 2.1
+  (Your host app + Gradle + Kotlin versions must match. If the native module uses Kotlin 2.1, the app must not force an incompatible Kotlin version.)
+- Java 17
+- Android Studio (includes Android SDK + Platform Tools / adb)
+
+## Running the example app (iOS)
+
+### Create and Configure the `.env` File
+
+Navigate to the example project and create the environment file:
+
+```
+cd example
+cp .env.example .env
+```
+### Example:
+
+```
+URL=https://test.webid-solutions.de
+USERNAME=your_username
+API_KEY=your_api_key
+CERT_BASE64=your_cert_base64
+# optional (only if your JS/native side uses sha pins directly)
+# SHA_PINS=sha256/AAAA...,sha256/BBBB...
+```
+
+Edit the .env file and add your username and API key.
+
+### Install Dependencies
+
+From the repository root:
+
+```
+yarn install
+```
+
+### Running the App
+
+Then navigate to the iOS example project:
+
+```
+cd example/android
+yarn start
+```
+In a second terminal:
+```
+cd example
+yarn android
+```
 
 # iOS