Update README.md to add beamer slides

README.md

 # University Of Southampton LaTeX documents
 LaTeX Documents for the University of Southampton. Mainly for Thesis and project reports
 
+For slides with Beamer, please see https://git.soton.ac.uk/sw2f11/latex-slides-template
 ## Your `{TEXMF}` root subdirectory
 For Tex Live: This whole folder can be moved into the `~/texmf` directory to begin using the class files.