Added Makefile to easily manage build dependencies

[daniel-ruiz]

At the time I cloned the repository and tried to make the game work, I noticed that some dependencies were missing and I needed to add them manually.

Now that I solved this little inconvenient, I thought it was a good idea to manage that steps with a Makefile and add some install notes on the README file.

Hope it is useful for more people than me.

Update: I have been examining the issue tracker and I think this Pull Request could be useful to fix #1