📝 Add some README for documenting samples

samples/README.md

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+# Samples Projects
+
+Here is a list of sample projects that demonstrate how to use the Kotlin Picker library:
+
+- `sample-core`: A Kotlin Multiplatform project using Picker in a shared viewModel targeting Android, JVM, WASM, JS, iOS Swift, macOS Swift and iOS Compose.
+- `sample-compose`: A Compose Multiplatform project using Picker in a Composable targeting Android, iOS, JVM, WASM, 

samples/sample-compose/README.md

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+# Sample Compose
+
+This sample project demonstrates the use of Kotlin Picker Compose.
+
+## 🌱 Important parts
+
+The important part of this sample is:
+- [App.kt](https://github.com/vinceglb/PickerKotlin/blob/main/samples/sample-compose/composeApp/src/commonMain/kotlin/App.kt) in the composeApp module where the file picker is used.
+
+## 🚀 Running the sample project
+
+By openning KotlinPicker in Android Studio or IntelliJ IDEA, you will be able to run the sample project on all platforms.
+
+```bash
+# Run on JVM
+./gradlew samples:sample-compose:composeApp:run
+
+# Run on WASM
+./gradlew samples:sample-compose:composeApp:wasmJsBrowserDevelopmentRun
+```

samples/sample-core/README.md

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+# Sample Core
+
+This sample project demonstrates the use of Kotlin Picker Core in a shared viewModel targeting Android, JVM, WASM, JS, iOS Swift, macOS Swift and iOS Compose.
+
+## 🌱 Important parts
+
+The important parts of this sample are:
+
+- [MainViewModel.kt](https://github.com/vinceglb/PickerKotlin/blob/main/samples/sample-core/shared/src/commonMain/kotlin/io/github/vinceglb/sample/core/MainViewModel.kt) in the shared module. It's here where the file picker is used.
+- [App.kt](https://github.com/vinceglb/PickerKotlin/blob/main/samples/sample-core/composeApp/src/commonMain/kotlin/io/github/vinceglb/sample/core/compose/App.kt) in the composeApp module where the state is consumed and the viewModel is called.
+- [ContentView.swift](https://github.com/vinceglb/PickerKotlin/blob/main/samples/sample-core/appleApps/macOSApp/ContentView.swift) in the iOSApp and macOSApp modules where the state is consumed and the viewModel is called in Swift.
+- [MainActivity.kt](https://github.com/vinceglb/PickerKotlin/blob/main/samples/sample-core/composeApp/src/androidMain/kotlin/io/github/vinceglb/sample/core/compose/MainActivity.kt) where we initialize the Picker in Android.
+
+## 🚀 Running the sample project
+
+By openning KotlinPicker in Android Studio or IntelliJ IDEA, you will be able to run the sample project on all platforms.
+
+```bash
+# Run on JVM
+./gradlew samples:sample-core:composeApp:run
+
+# Run on WASM
+samples:sample-core:composeApp:wasmJsBrowserDevelopmentRun
+```