added session runner draft

src/Controlers/SessionRunner.py

@@ -0,0 +1,23 @@
+### another way (but again *not the only way*) to do it ###
+
+from contextlib import contextmanager
+
+@contextmanager
+def session_scope():
+    """Provide a transactional scope around a series of operations."""
+    session = Session()
+    try:
+        yield session
+        session.commit()
+    except:
+        session.rollback()
+        raise
+    finally:
+        session.close()
+
+
+#all session.add will be done in session_scope(). tbd: remove individual commits from ORM_test.py
+def run_my_program():
+    with session_scope() as session:
+        #ThingOne().go(session)
+        #ThingTwo().go(session)