added file chooser with extension filter

client/src/main/kotlin/org/hso/texturesyncclient/view/importView/ImportViewController.kt

@@ -1,14 +1,22 @@
 package org.hso.texturesyncclient.view.importView
 
+import javafx.stage.FileChooser
+import javafx.stage.FileChooser.ExtensionFilter
 import tornadofx.Controller
+import tornadofx.FileChooserMode
+import tornadofx.chooseFile
 
 class ImportViewController : Controller() {
 
     fun btnFileChooserAction() {
         println("btn click")
 
-        
+        var list = listOf("*.png", "*.PNG", "*.jpg", "*.JPG", "*.jpeg", "*.JPEG")
+        var filter = ExtensionFilter("Texturen vom Bildformat: PNG oder JPG", list)
+        val arrayFilter = arrayOf(filter)
+        var file = chooseFile("Textur auswählen", arrayFilter, FileChooserMode.Single, owner = null)
 
+        println(file)
 
     }
 }