added configuration endpoint which sends tou link and version info

controller/configuration.go

@@ -0,0 +1,30 @@
+package controller
+
+import (
+	"github.com/go-openapi/runtime/middleware"
+	"github.com/openziti/zrok/build"
+	"github.com/openziti/zrok/rest_model_zrok"
+	"github.com/openziti/zrok/rest_server_zrok/operations/metadata"
+)
+
+type configurationHandler struct {
+	cfg *Config
+}
+
+func newConfigurationHandler(cfg *Config) *configurationHandler {
+	return &configurationHandler{
+		cfg: cfg,
+	}
+}
+
+func (ch *configurationHandler) Handle(_ metadata.ConfigurationParams) middleware.Responder {
+	tou := ""
+	if cfg.Admin != nil {
+		tou = cfg.Admin.TouLink
+	}
+	data := &rest_model_zrok.Configuration{
+		Version: build.String(),
+		TouLink: tou,
+	}
+	return metadata.NewConfigurationOK().WithPayload(data)
+}