Add contributor guide and project usage docs

src/lazy_enter/__main__.py

@@ -0,0 +1,12 @@
+"""CLI 엔트리포인트."""
+
+from lazy_enter.bridge import Bridge
+
+
+def main() -> None:
+    bridge = Bridge()
+    bridge.run()
+
+
+if __name__ == "__main__":
+    main()