adding ai_economist for modding

ai_economist/foundation/agents/__init__.py

@@ -0,0 +1,12 @@
+# Copyright (c) 2020, salesforce.com, inc.
+# All rights reserved.
+# SPDX-License-Identifier: BSD-3-Clause
+# For full license text, see the LICENSE file in the repo root
+# or https://opensource.org/licenses/BSD-3-Clause
+
+from ai_economist.foundation.base.base_agent import agent_registry
+
+from . import mobiles, planners
+
+# Import files that add Agent class(es) to agent_registry
+# -------------------------------------------------------