IVGCVSW-7024 Add missing license info for reuse lint

Signed-off-by: Jim Flynn <jim.flynn@arm.com>
Change-Id: I97dee6982e0a7be01c13e9e803c0997547a39ff1
diff --git a/docs/Arm_NN_horizontal_blue.png.license b/docs/Arm_NN_horizontal_blue.png.license
new file mode 100644
index 0000000..344cf33
--- /dev/null
+++ b/docs/Arm_NN_horizontal_blue.png.license
@@ -0,0 +1,4 @@
+#
+# Copyright © 2020 Arm Ltd and Contributors. All rights reserved.
+# SPDX-License-Identifier: MIT
+#