Add a main function for the edit monitor

Test: make edit_monitor and run edit_monitor and check the log file
bug: 365617369
Change-Id: Iab8e6250e7e11eba6b57932358a4f1cd949c4121
diff --git a/tools/edit_monitor/Android.bp b/tools/edit_monitor/Android.bp
index 08ca155..3497821 100644
--- a/tools/edit_monitor/Android.bp
+++ b/tools/edit_monitor/Android.bp
@@ -52,3 +52,15 @@
         unit_test: true,
     },
 }
+
+python_binary_host {
+    name: "edit_monitor",
+    pkg_path: "edit_monitor",
+    srcs: [
+        "main.py",
+    ],
+    libs: [
+        "edit_monitor_lib",
+    ],
+    main: "main.py",
+}