Implemented Subtask List & create

Example shell script see "create-subtasks.sh"

NOT FINISHED!

create-subtasks.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+while IFS= read -r TEXT
+  do
+    python3 main.py -c ./config-mira.json subtask create --project 310 --task 6253 --body "$TEXT"
+  done
+