File not found Fixes

src/main/kotlin/de/steamwar/data/Groups.kt

@@ -15,7 +15,14 @@ data class GroupData(val name: String, val fights: MutableList<Int>)
 @OptIn(ExperimentalSerializationApi::class)
 class Groups {
     companion object {
-        private var groups: GroupsData = Cbor.decodeFromByteArray(kGroupsFile.readBytes())
+        private var groups: GroupsData = if (kGroupsFile.exists()) {
+            Cbor.decodeFromByteArray(kGroupsFile.readBytes())
+        } else {
+            kGroupsFile.createNewFile()
+            kGroupsFile.writeBytes(Cbor.encodeToByteArray(GroupsData(mutableListOf())))
+
+            GroupsData(mutableListOf())
+        }
 
         fun getGroup(name: String): GroupData? {
             return groups.groups.find { it.name == name }