Update version info for 1.6.x

Change-Id: I23b4d1a2441d34e75daddb8d4cdbb846fb13421e
Signed-off-by: Nico Huber <nico.h@gmx.de>
diff --git a/versioninfo.inc b/versioninfo.inc
new file mode 100644
index 0000000..dc0bc5b
--- /dev/null
+++ b/versioninfo.inc
@@ -0,0 +1,2 @@
+VERSION = 1.6.x
+MAN_DATE = 2026-07-17