Add in README instruction to compile and execute example code about goth HOT 1 CLOSED

$ go version
go version go1.7.4 darwin/amd64
$ export GOPATH=~/go/
$ export GOBIN=~/go/bin
$ git clone [email protected]:markbates/goth.git
$ cd goth
$ cd examples
$ go get -v
github.com/gorilla/pat (download)
github.com/gorilla/mux (download)
github.com/gorilla/sessions (download)
github.com/gorilla/securecookie (download)
github.com/markbates/goth (download)
Fetching https://golang.org/x/oauth2?go-get=1
Parsing meta tags from https://golang.org/x/oauth2?go-get=1 (status code 200)
get "golang.org/x/oauth2": found meta tag main.metaImport{Prefix:"golang.org/x/oauth2", VCS:"git", RepoRoot:"https://go.googlesource.com/oauth2"} at https://golang.org/x/oauth2?go-get=1
golang.org/x/oauth2 (download)
github.com/mrjones/oauth (download)
github.com/gorilla/securecookie
github.com/gorilla/mux
golang.org/x/oauth2/internal
github.com/mrjones/oauth
golang.org/x/oauth2
github.com/gorilla/sessions
github.com/gorilla/pat
github.com/markbates/goth
github.com/markbates/goth/gothic
github.com/markbates/goth/providers/amazon
github.com/markbates/goth/providers/bitbucket
github.com/markbates/goth/providers/box
github.com/markbates/goth/providers/deezer
github.com/markbates/goth/providers/dailymotion
github.com/markbates/goth/providers/digitalocean
github.com/markbates/goth/providers/discord
github.com/markbates/goth/providers/dropbox
github.com/markbates/goth/providers/facebook
github.com/markbates/goth/providers/fitbit
github.com/markbates/goth/providers/github
github.com/markbates/goth/providers/gitlab
github.com/markbates/goth/providers/gplus
github.com/markbates/goth/providers/heroku
github.com/markbates/goth/providers/instagram
github.com/markbates/goth/providers/intercom
github.com/markbates/goth/providers/lastfm
github.com/markbates/goth/providers/linkedin
github.com/markbates/goth/providers/onedrive
github.com/markbates/goth/providers/paypal
github.com/markbates/goth/providers/salesforce
github.com/markbates/goth/providers/slack
github.com/markbates/goth/providers/soundcloud
github.com/markbates/goth/providers/spotify
github.com/markbates/goth/providers/steam
github.com/markbates/goth/providers/stripe
github.com/markbates/goth/providers/twitch
github.com/markbates/goth/providers/twitter
github.com/markbates/goth/providers/uber
github.com/markbates/goth/providers/wepay
github.com/markbates/goth/providers/yahoo
github.com/markbates/goth/providers/yammer
_/Users/stephane/tests/goth/examples
$ go build
$ ./examples