First of all, install quicktemplate package and quicktemplate compiler
go get -u github.com/valyala/quicktemplate
go get -u github.com/valyala/quicktemplate/qtc
The example has the Go code compiled already for you, therefore:
go run main.go # http://localhost:8080
However there is an instruction below, full documentation can be found at https://github.com/valyala/quicktemplate.
Save your template files into templates folder under the extension *.qtpl, open your terminal and run qtc inside this folder.
If all went ok, *.qtpl.go files must appear in the templates folder. These files contain the Go code for all *.qtpl files.
Remember, each time you change a a /templates/*.qtpl file you have to run the qtc command and re-build your application.