Add commencement speech generator project (#100)

h/t @whatrocks

README.md

@@ -234,6 +234,7 @@ print(combined_model.make_sentence())
 - [adam](http://bziarkowski.pl/adam), polish poetry generator. [[code](https://github.com/bziarkowski/adam)]
 - [Stackexchange Simulator](https://se-simulator.lw1.at/), which uses StackExchange's bulk data to generate random questions and answers. [[code](https://github.com/Findus23/se-simulator)]
 - [@BloggingBot](https://twitter.com/BloggingBot), tweets sentences based on a corpus of 17 years of [blogging](http://artlung.com/blog/2018/02/23/markov-chains-are-hilarious/).
+- [Commencement Speech Generator](https://github.com/whatrocks/markov-commencement-speech), generates "graduation speech"-style quotes from a dataset of the "greatest of all time" commencement speeches)
 
 Have other examples? Pull requests welcome.