Added basic description.

tuos-poster/README.md

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+# tuos-poster
+A LaTeX class (based on the [beamerposter](https://www.ctan.org/tex-archive/macros/latex/contrib/beamerposter))
+that roughly follows the 
+[PowerPoint Poster guidelines](http://www.sheffield.ac.uk/marketing/visual-identity/downloads/powerpoint-templates) 
+of The University of Sheffield.
+
+## Disclaimer
+Please not that this LaTeX setup is neither endorsed nor officially
+supported by the University of Sheffield.
+
+## Prerequisites 
+* The `tuos-presentation` theme/class.
+
+## Installation 
+* Copy the various `*.sty` and `*.cls` files into your `texmf` tree. 
+
+## Usage
+The `tuos-poster` class (respectively, a beamerposter theme) is a
+customised setup of the
+[beamer class](https://www.ctan.org/pkg/beamer) and  of the 
+[beamerposter](https://www.ctan.org/tex-archive/macros/latex/contrib/beamerposter) package. 
+Thus, please consult their documentation for detailed use. In general, you 
+can either use the class file (i.e., `\documentclass{tuos-poster}` or use
+`\usetheme{tuos-poster}` in a regular beamerposter setup.
+
+The class/theme provides the following options:
+* `colour`: for using the colour variant of The University of
+  Sheffield layout (default is the white variant). 
+* `plainfonts`: For using the standard LaTex fonts instead of the cooperate fonts of The
+  University of Sheffield. There are mainly two reasons why you want to
+  use this option:
+  * The cooperate fonts do not provide mathematical symbols. Thus, if
+    you want to write mathematical content in your letter, the LaTeX
+    fonts might be the better choice (or add a suitable LaTeX package
+    providing mathematical symbols.
+  * You do not want to fiddle with your font installation.
+    
+
+## License
+This project is dual-licensed under a 2-clause BSD-style license and/or 
+the LPPL version 1 or any later version. 
+