MonkeySim only has one requirement (other than Golang) -- it uses dep for dependency management. Check out their repository for info on how to install it locally. If you don't want to deal with all that, the only external dependency we currently have is gin-gonic/gin, so running go get github.com/gin-gonic/gin should work just as well as running dep ensure, at least for now.
To run:
dep ensure
go build
./monkeysim
./monkeysim takes an optional command line parameter for specifying how many monkeys to spin up at once. Default is 1, but can be any number. For example: ./monkeysim 11 will make 11 monkeys typing at 11 typewriters. Once it's running, open a browser and go to localhost:8080 to see the status of your simulation.
You will also need a text file in the same directory as the monkeysim binary called target.txt -- this is what the monkeys' success will be judged against. You can use any old file (type something yourself, grab a text file from Project Gutenberg, etc.), but check out the getTarget() function in the helpers file -- there are lots of things stripped out of the target, including line breaks, punctuation, and padding using multiple spaces. (In addition, all capital letters are shifted to lower-case.)