simple-ctrl-client: Add basic help/usage information
diff --git a/osmo-ctrl-client.c b/osmo-ctrl-client.c
index 7dd354e..83e9b7b 100644
--- a/osmo-ctrl-client.c
+++ b/osmo-ctrl-client.c
@@ -35,7 +35,10 @@
 
 static void exit_help(void)
 {
-	printf("help!\n");
+	printf("Usage:\n");
+	printf("\tosmo-ctrl-client HOST PORT get VARIABLE\n");
+	printf("\tosmo-ctrl-client HOST PORT set VARIABLE VALUE\n");
+	printf("\tosmo-ctrl-client HOST PORT monitor\n");
 	exit(2);
 }