Add TaskCollectionReaderFactory interface

Author: Gerrit Garbereder

Task-Tracker-Usecases/src/commonMain/kotlin/com/garbereder/tasktracker/usecases/tasks/TaskCollectionReaderFactory.kt

@@ -0,0 +1,5 @@
+package com.garbereder.tasktracker.usecases.tasks
+
+interface TaskCollectionReaderFactory {
+    fun create(): TaskCollectionReader
+}