Added Powerpoint Templates

These are in 4:3 and 16:9 format, loosely based on UHH design
guidelines.

README.md

@@ -17,6 +17,11 @@ Compile it with `LuaLaTeX`, for details see the `Makefile`.
 
 The main file is `poster.tex`, the custom style is defined in `layout/beamerthemeLasNQposter.sty`
 
+## PowerPoint
+
+This template is loosely based on the UHH style guide, but provides plenty of
+space for your own content. There are two versions available, in 4:3 standard format and 16:9 wide-screen format. If in doubt, use the 4:3 template, as it will work everywhere.
+
 ## Make your own
 
 If you want to use one of the templates, the nicest way is to [fork](https://docs.gitlab.com/ee/workflow/forking_workflow.html) the project.