Added files.

store.go

@@ -0,0 +1,22 @@
+package imap
+
+// StoreOptions contains options for the STORE command.
+type StoreOptions struct {
+	UnchangedSince uint64 // requires CONDSTORE
+}
+
+// StoreFlagsOp is a flag operation: set, add or delete.
+type StoreFlagsOp int
+
+const (
+	StoreFlagsSet StoreFlagsOp = iota
+	StoreFlagsAdd
+	StoreFlagsDel
+)
+
+// StoreFlags alters message flags.
+type StoreFlags struct {
+	Op     StoreFlagsOp
+	Silent bool
+	Flags  []Flag
+}