Add Go snippets

snippets/go/send_spontaneous_payment.go

@@ -0,0 +1,19 @@
+package example
+
+import (
+	"log"
+
+	"github.com/breez/breez-sdk-go/breez_sdk"
+)
+
+func SendSpontaneousPayment() {
+	// ANCHOR: send-spontaneous-payment
+	sendSpontaneousPaymentRequest := breez_sdk.SendSpontaneousPaymentRequest{
+		NodeId:     "...",
+		AmountMsat: uint64(3_000_000),
+	}
+	if response, err := sdk.SendSpontaneousPayment(sendSpontaneousPaymentRequest); err == nil {
+		log.Printf("%#v", response)
+	}
+	// ANCHOR_END: send-spontaneous-payment
+}