Add ktree sample

sample/ktree/.gitignore

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+/build

sample/ktree/build.gradle

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+import com.soywiz.korge.gradle.*
+
+apply plugin: com.soywiz.korge.gradle.KorgeGradlePlugin
+
+korge {
+	id = "com.soywiz.samples.ktree"
+	targetDefault()
+}

sample/ktree/src/commonMain/kotlin/main.kt

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+import com.soywiz.korge.*
+import com.soywiz.korge.view.*
+import com.soywiz.korge.view.ktree.*
+import com.soywiz.korim.color.*
+import com.soywiz.korio.file.std.*
+
+suspend fun main() = Korge(bgcolor = Colors["#172335"]) {
+	addChild(resourcesVfs["scene.ktree"].readKTree(views()))
+}

sample/ktree/src/commonMain/resources/scene.ktree

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+<container>
+	<solidrect name="big" colorMul="#ff7700ff" x="266.0" y="266.0" scaleX="1.2985" scaleY="1.2985" width="187.76037196064794" height="190.27994117181697"/>
+	<container>
+		<solidrect name="small" colorMul="#ff0000ff" x="266.0" y="266.0" anchorY="1.0" width="100.0" height="100.0"/>
+	</container>
+</container>