add command line script

diff --git a/scripts/gps303 b/scripts/gps303
new file mode 100755 (executable)
index 0000000..d9876b7
--- /dev/null
+++ b/scripts/gps303
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+exec python3 -m gps303 $*