[#126] sdk: add usage example

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

pkg/client/client_test.go

@@ -0,0 +1,58 @@
+package client_test
+
+import (
+	"context"
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/nspcc-dev/neofs-api-go/pkg/client"
+	"github.com/nspcc-dev/neofs-api-go/pkg/container"
+	"github.com/nspcc-dev/neofs-crypto/test"
+	"github.com/stretchr/testify/require"
+	"google.golang.org/grpc"
+)
+
+func TestExample(t *testing.T) {
+	t.Skip()
+	target := "s01.localtest.nspcc.ru:50501"
+	key := test.DecodeKey(-1)
+
+	// create client from address
+	cli, err := client.New(key, client.WithAddress(target))
+	require.NoError(t, err)
+
+	// ask for balance
+	resp, err := cli.GetSelfBalance(context.Background())
+	require.NoError(t, err)
+
+	fmt.Println(resp.GetValue(), resp.GetPrecision())
+
+	// create client from grpc connection
+	conn, err := grpc.DialContext(context.Background(), target, grpc.WithBlock(), grpc.WithInsecure())
+	require.NoError(t, err)
+
+	cli, err = client.New(key, client.WithGRPCConnection(conn))
+	require.NoError(t, err)
+
+	// this container has random nonce and it does not set owner id
+	cnr, err := container.New(
+		container.WithAttribute("CreatedAt", time.Now().String()),
+		container.WithPolicy("PUT 3 In *"),
+		container.WithReadOnlyBasicACL(),
+	)
+	require.NoError(t, err)
+
+	// here container will have owner id from client key, and it will be signed
+	containerID, err := cli.PutContainer(context.Background(), cnr, client.WithTTL(10))
+	require.NoError(t, err)
+
+	fmt.Println(containerID)
+
+	list, err := cli.ListSelfContainers(context.Background())
+	require.NoError(t, err)
+
+	for i := range list {
+		fmt.Println("found container:", list[i])
+	}
+}