Initial version

Project structure, api, discovery service, docker.

pkg/discovery/options.go

@@ -0,0 +1,19 @@
+package discovery
+
+import (
+	"time"
+)
+
+type Option func(*Discovery)
+
+func WithBroadcastInterval(v time.Duration) Option {
+	return func(discovery *Discovery) {
+		discovery.broadcastInterval = v
+	}
+}
+
+func WithDebug() Option {
+	return func(discovery *Discovery) {
+		discovery.debug = true
+	}
+}