Added metainfo python code.

orcaparser/metainfo/__init__.py

+import sys
+from nomad.metainfo import Environment
+from nomad.metainfo.legacy import LegacyMetainfoEnvironment
+import orcaparser.metainfo.orca
+import nomad.datamodel.metainfo.common
+import nomad.datamodel.metainfo.public
+import nomad.datamodel.metainfo.general
+
+m_env = LegacyMetainfoEnvironment()
+m_env.m_add_sub_section(Environment.packages, sys.modules['orcaparser.metainfo.orca'].m_package)  # type: ignore
+m_env.m_add_sub_section(Environment.packages, sys.modules['nomad.datamodel.metainfo.common'].m_package)  # type: ignore
+m_env.m_add_sub_section(Environment.packages, sys.modules['nomad.datamodel.metainfo.public'].m_package)  # type: ignore
+m_env.m_add_sub_section(Environment.packages, sys.modules['nomad.datamodel.metainfo.general'].m_package)  # type: ignore