Visualize lines of source code by module

This visualization generates a stacked bar chart depicting lines of code
within each module broken down by language.

Change-Id: I7a14a6dcf38a6611c41e21182177bb23a4baf2a2
diff --git a/script/graphs/sloc-viz.plot b/script/graphs/sloc-viz.plot
new file mode 100644
index 0000000..a334b89
--- /dev/null
+++ b/script/graphs/sloc-viz.plot
@@ -0,0 +1,23 @@
+#
+# Copyright (c) 2021 Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+#
+# Stacked histograms
+#
+set terminal png enhanced font ",18" size 1920, 1080
+set title "Source Lines of Code by Module"
+set key invert reverse Left outside
+set key autotitle columnheader
+set auto y
+set auto x
+unset xtics
+set xtics nomirror rotate by -75 scale 0
+set style data histogram
+set style histogram rowstacked
+set style fill solid border -1
+set boxwidth 0.75
+#
+plot ARG1 using 2:xtic(1), for [i=3:8] '' using i
+#