Add README.md

Add README.md with project details and integration instructions

Author: Dr-TSNG

README.md

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+# libxposed API
+
+[![API](https://img.shields.io/badge/API-101-brightgreen)](https://github.com/libxposed/api)
+[![Maven Central](https://img.shields.io/maven-central/v/io.github.libxposed/api?color=blue)](https://central.sonatype.com/artifact/io.github.libxposed/api)
+[![Android Min SDK](https://img.shields.io/badge/minSdk-26-orange)](https://developer.android.com/about/versions/oreo)
+[![License](https://img.shields.io/github/license/libxposed/api)](LICENSE)
+
+Modern Xposed Module API — a type-safe, redesigned replacement for the legacy XposedBridge API.
+
+## Integration
+
+```groovy
+dependencies {
+    compileOnly "io.github.libxposed:api:101.0.0"
+}
+```
+
+```kotlin
+dependencies {
+    compileOnly("io.github.libxposed:api:101.0.0")
+}
+```
+
+## Documentation
+
+- [Guide](https://github.com/LSPosed/LSPosed/wiki/Develop-Xposed-Modules-Using-Modern-Xposed-API) — Getting started with the modern Xposed API
+- [Javadoc](api/src/main/java/io/github/libxposed/api/package-info.java) — Package-level API overview
+
+## Related Projects
+
+- [libxposed/helper](https://github.com/libxposed/helper) — Friendly development kit library
+- [libxposed/service](https://github.com/libxposed/service) — Framework communication service
+
+## License
+
+This project is licensed under the [Apache License 2.0](LICENSE).