Added CLI and more functionality

internal/server/server.go

@@ -0,0 +1,16 @@
+package server
+
+import (
+	"fmt"
+	"net/http"
+)
+
+func Start(host string, port int) error {
+	http.HandleFunc("/oauth/callback", getAuthorizationCode)
+	err := http.ListenAndServe(host+":"+fmt.Sprintf("%d", port), nil)
+	return err
+}
+
+func getAuthorizationCode(w http.ResponseWriter, r *http.Request) {
+	fmt.Printf("response from OIDC provider: %v\n", r)
+}