no provider for openid-connect exists

Nobody has claimed this yet.

I keep getting `no provider for openid-connect exists` when I try to connect to local keycloak.

```
package main

import (
"fmt"
"html/template"
"net/http"

"github.com/markbates/goth"
"github.com/markbates/goth/gothic"
"github.com/markbates/goth/providers/openidConnect"
)

func main() {

openidConnect, _ := openidConnect.New("idp", "SECRET", "http://localhost:7080/realms/svcs/.well-known/openid-configuration", "http://localhost:8080/auth/openid-connect/callback")

if openidConnect != nil {
goth.UseProviders(openidConnect)
}
// Note that the redirect URL is different here than in your original code.
//goth.UseProviders(oid)

r := http.NewServeMux()
r.HandleFunc("GET /auth/openid-connect/callback", func(res http.ResponseWriter, r *http.Request) {
q := r.URL.Query()
q.Add("provider", "openid-connect")
r.URL.RawQuery = q.Encode()
user, err := gothic.CompleteUserAuth(res, r)
if err != nil {
fmt.Println("error ", err)
}

t, _ := template.New("foo").Parse(userTemplate)
t.Execute(res, user)
})
r.HandleFunc("GET /auth/openid-connect", handleAuth)

r.HandleFunc("/", func(writer http.ResponseWriter, r *http.Request) {

t, _ := template.New("foo").Parse(indexTemplate)
t.Execute(writer, nil)
})

http.ListenAndServe(":8080", r)

}
func handleAuth(w http.ResponseWriter, r *http.Request) {
q := r.URL.Query()
q.Add("provider", "openid-connect")
r.URL.RawQuery = q.Encode()

gothic.BeginAuthHandler(w, r)
}

var indexTemplate = `

Log in

`

var userTemplate = `

Name: {{.Name}}

Email: {{.Email}}

NickName: {{.NickName}}

Location: {{.Location}}

AvatarURL: {{.AvatarURL}}

Description: {{.Description}}

UserID: {{.UserID}}

AccessToken: {{.AccessToken}}

`
```
Keycloak is running and the client is set. What am missing?

Start with the shown openidConnect.New call and inspect its returned error before goth.UseProviders is invoked. Trace how gothic.BeginAuthHandler and CompleteUserAuth look up the provider named in the request. Done means identifying the configuration or registration mismatch that causes the reported provider error and confirming the example can complete authentication.

Written by the indexing model from the issue text.