Manual: add missing calendar image for M:Robe 100.

Change-Id: Ia07adc0f2e534ff88f378a456c973cc8adaa5627
diff --git a/manual/plugins/images/ss-calendar-160x128x1.png b/manual/plugins/images/ss-calendar-160x128x1.png
new file mode 100644
index 0000000..a2f66c1
--- /dev/null
+++ b/manual/plugins/images/ss-calendar-160x128x1.png
Binary files differ