site and webhooks packages stubbed

internal/webhooks/etsy/webhooks.go

@@ -0,0 +1,17 @@
+package etsy
+
+import (
+	"fmt"
+	"net/http"
+)
+
+func NewWebhookHandler() http.Handler {
+	mux := http.NewServeMux()
+
+	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "text/plain")
+		w.Write([]byte(fmt.Sprintf("received etsy webhook call: %s %s\n", r.Method, r.URL)))
+	})
+
+	return mux
+}