Bootstrap repo

Closes #1 (closed)

worker_generic_training_dataset/worker.py

+# -*- coding: utf-8 -*-
+from arkindex_worker.worker import ElementsWorker
+
+
+class Demo(ElementsWorker):
+    def process_element(self, element):
+        print("Demo processing element", element)
+
+
+def main():
+    Demo(
+        description="Fill base-worker cache with information about dataset and extract images"
+    ).run()
+
+
+if __name__ == "__main__":
+    main()