feat: Main window and sub-window registration

Change-Id: I1cdb905ba06139f8b6f63b7411c7c0c3f8f821fa
diff --git a/dcs/__main__.py b/dcs/__main__.py
new file mode 100644
index 0000000..194ffbd
--- /dev/null
+++ b/dcs/__main__.py
@@ -0,0 +1,11 @@
+#  SPDX-License-Identifier: MPL-2.0
+#    Copyright (c) 2022 Philipp Le <philipp@philipple.de>.
+#  This Source Code Form is subject to the terms of the Mozilla Public
+#  License, v. 2.0. If a copy of the MPL was not distributed with this
+#  file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+from .main import main
+
+
+if __name__ == '__main__':
+    main()