Update modules.md (#207)

added photon-flip/watermark-module

Author: BertKoor

download/modules.md

@@ -499,3 +499,12 @@ It displays data via the extended “Facts and Events” tab, enhancing places w
 obtained from the respective shared place.
 
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+
+### Watermark Module - by photon-flip - `2.2` - [website](https://github.com/photon-flip/watermark-module)
+
+This custom module changes the default position of the watermark image. The position can be set to top, center or bottom. 
+To position watermarks left or right use white space in the watermark image to pad the text or symbol left or right.
+
+The default installation contains default webtrees watermark image, some sample images and a Photshop PSD template image as a basis for your own personalized watermarks.
+
+----------