Adding native libui ui

sample/src/nativeMain/kotlin/Runner.kt

@@ -1,5 +1,6 @@
 import com.ionspin.kotlin.crypto.sample.Sample
 
-fun main() {
+fun main() : Unit {
     Sample.runSample()
+    ui()
 }

sample/src/nativeMain/kotlin/com/ionspin/kotlin/crypto/sample/UI.kt

@@ -0,0 +1,30 @@
+import com.ionspin.kotlin.crypto.hash.Hash
+import com.ionspin.kotlin.crypto.util.encodeToUByteArray
+import com.ionspin.kotlin.crypto.util.toHexString
+import libui.ktx.TextArea
+import libui.ktx.appWindow
+import libui.ktx.button
+import libui.ktx.textarea
+import libui.ktx.vbox
+
+fun ui() = appWindow(
+    title = "Hello",
+    width = 320,
+    height = 240
+) {
+    val hash = Hash.sha512("123".encodeToUByteArray())
+    val text = "Hash (SHA512) of 123: ${hash.toHexString()}"
+    vbox {
+        lateinit var scroll: TextArea
+
+        button("Test") {
+            action {
+                scroll.append(text.trimMargin())
+            }
+        }
+        scroll = textarea {
+            readonly = true
+            stretchy = true
+        }
+    }
+}