Update README.md

For those landing on this page before POMDPs.jl and having not idea of the meaning of the acronym POMDP.

README.md

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 [![Build Status](https://travis-ci.org/JuliaPOMDP/POMDPExamples.jl.svg?branch=master)](https://travis-ci.org/JuliaPOMDP/POMDPExamples.jl)
 
-This is a repository of examples and tutorials for learning how to use the POMDPs.jl package. See also [QuickPOMDPs.jl](https://github.com/JuliaPOMDP/QuickPOMDPs.jl) for a concise way to define problems.
+This is a repository of examples and tutorials for learning how to use the [POMDPs.jl package](https://github.com/JuliaPOMDP/POMDPs.jl) for working with Markov Decision Processes (MDPs) and Partially Observable Markov Decision Processes (POMDPs). See also [QuickPOMDPs.jl](https://github.com/JuliaPOMDP/QuickPOMDPs.jl) for a concise way to define problems.
 
 ## Tutorials