doc: add missing namespaces package
Currently, we can not reproduce the given Namespaces
section examples written in the README, since it's
not clear to which package should we import to.
@@ -77,8 +77,11 @@ containerd offers a full client package to help you integrate containerd into yo
```go
import (
+ "context"
+
"github.com/containerd/containerd"
"github.com/containerd/containerd/cio"
+ "github.com/containerd/containerd/namespaces"
)
