Added files.

namespace.go

@@ -0,0 +1,14 @@
+package imap
+
+// NamespaceData is the data returned by the NAMESPACE command.
+type NamespaceData struct {
+	Personal []NamespaceDescriptor
+	Other    []NamespaceDescriptor
+	Shared   []NamespaceDescriptor
+}
+
+// NamespaceDescriptor describes a namespace.
+type NamespaceDescriptor struct {
+	Prefix string
+	Delim  rune
+}