Commit: Bulk unfinished work

fx/interfaces/stores/messagestore.go

@@ -0,0 +1,17 @@
+package stores
+
+import "context"
+
+type Message struct {
+	Id      int
+	From    string
+	Subject string
+	Body    string
+}
+
+type MessageStore interface {
+	AddMessage(ctx context.Context, m *Message) error
+	GetMessage(ctx context.Context, id int) (*Message, error)
+	ListMessages(ctx context.Context) ([]*Message, error)
+	RemoveMessage(ctx context.Context, id int) error
+}