add README

README.md

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+# Kotlin ByteArray Utilities
+
+This library provides various utilities for working with ByteArray in Kotlin Multiplatform.
+
+## Features
+
+* Multiplatform support
+    * JVM
+    * JavaScript
+    * Native (Linux)
+
+## Installation
+
+Add the following to your `build.gradle.kts`.
+
+```kotlin
+repositories {
+    maven("https://git.infendro.com/api/packages/Infendro/maven")
+}
+
+dependencies {
+    implementation("com.infendro:bytearray:1.1.1")
+}
+```