add methods for messaging

schema/schema.common.graphql

@@ -1,2 +1,23 @@
 
 scalar DateTime
+
+type Query {
+	signIn(id: Int!, password: String!): signInPayload!
+	signOut: signOutPayload!
+	
+	getMessages(count: Int = 100, page: Int = 1): [Message!]!
+}
+
+type Mutation {
+	registerUser(input: registerUserInput!): User!
+	
+	createMessage(input: MessageInput!): createMessagePayload!
+	updateMessage(input: updateMessageInput!): createMessagePayload!
+	deleteMessage(id: Int!): deleteMessagePayload!
+}
+
+type Subscription {
+	messageCreated: Message!
+	messageUpdated: Message!
+	messageDeleted: Message!
+}