Add core devterm module files

devterm/main.py

@@ -0,0 +1,28 @@
+import sys
+import webbrowser
+from threading import Timer
+
+from devterm.server.app import run_server
+from devterm.tui.menu import DevtermMenu
+from devterm.config import get_settings
+
+
+def open_browser(host: str, port: int):
+    webbrowser.open(f"http://{host}:{port}")
+
+
+def main():
+    settings = get_settings()
+    menu = DevtermMenu()
+    menu.show_starting_message(settings.host, settings.port)
+
+    Timer(1.0, open_browser, [settings.host, settings.port]).start()
+
+    try:
+        run_server()
+    except KeyboardInterrupt:
+        sys.exit(0)
+
+
+if __name__ == "__main__":
+    main()