Update docs

docs/Messages.md

@@ -0,0 +1,11 @@
+# Mirai - Messages
+
+## 消息系统
+
+在 Contacts 章节提到，要发送消息，使用 `Contact.sendMessage(Message)`。
+
+[![](https://mermaid.ink/img/eyJjb2RlIjoiY2xhc3NEaWFncmFtXG5cbmNsYXNzIE1lc3NhZ2VDaGFpblxuTWVzc2FnZUNoYWluIDogTGlzdH5TaW5nbGVNZXNzYWdlflxuXG5NZXNzYWdlPHwtLU1lc3NhZ2VDaGFpblxuTWVzc2FnZTx8LS1TaW5nbGVNZXNzYWdlXG5cbk1lc3NhZ2VDaGFpbiBvLS0gU2luZ2xlTWVzc2FnZVxuXG5TaW5nbGVNZXNzYWdlPHwtLU1lc3NhZ2VDb250ZW50XG5TaW5nbGVNZXNzYWdlPHwtLU1lc3NhZ2VNZXRhZGF0YVxuXG4iLCJtZXJtYWlkIjp7InRoZW1lIjoiZGVmYXVsdCJ9LCJ1cGRhdGVFZGl0b3IiOmZhbHNlfQ)](https://mermaid-js.github.io/mermaid-live-editor/#/edit/eyJjb2RlIjoiY2xhc3NEaWFncmFtXG5cbmNsYXNzIE1lc3NhZ2VDaGFpblxuTWVzc2FnZUNoYWluIDogTGlzdH5TaW5nbGVNZXNzYWdlflxuXG5NZXNzYWdlPHwtLU1lc3NhZ2VDaGFpblxuTWVzc2FnZTx8LS1TaW5nbGVNZXNzYWdlXG5cbk1lc3NhZ2VDaGFpbiBvLS0gU2luZ2xlTWVzc2FnZVxuXG5TaW5nbGVNZXNzYWdlPHwtLU1lc3NhZ2VDb250ZW50XG5TaW5nbGVNZXNzYWdlPHwtLU1lc3NhZ2VNZXRhZGF0YVxuXG4iLCJtZXJtYWlkIjp7InRoZW1lIjoiZGVmYXVsdCJ9LCJ1cGRhdGVFZGl0b3IiOmZhbHNlfQ)
+
+`SingleMessage` 表示单个消息元素，`MessageChain`（消息链） 是 `List<SingleMessage>`。主动发送的消息和从服务器接收消息都是 `MessageChain`。
+
+mirai 提供大量消息链的扩展：[MessageChain.kt](../mirai-core-api/src/commonMain/kotlin/message/data/MessageChain.kt#L59)。

docs/src/Contacts.mermaid.md

@@ -57,18 +57,18 @@ class Member {
     +group: Group
 }
 
-ContactOrBot<--Contact
-ContactOrBot<--UserOrBot
+ContactOrBot<|--Contact
+ContactOrBot<|--UserOrBot
 
-UserOrBot<--Bot
-UserOrBot<--User
+UserOrBot<|--Bot
+UserOrBot<|--User
 
-Contact<--User
-Contact<--Group
+Contact<|--User
+Contact<|--Group
 
-User<--Member
-User<--Friend
+User<|--Member
+User<|--Friend
 
-Member<--NormalMember
-Member<--AnonymousMember
+Member<|--NormalMember
+Member<|--AnonymousMember
 ```

docs/src/Messages.mermaid.md

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+```mermaid
+classDiagram
+
+class MessageChain
+MessageChain : List~SingleMessage~
+
+Message<|--MessageChain
+Message<|--SingleMessage
+
+MessageChain o-- SingleMessage
+
+SingleMessage<|--MessageContent
+SingleMessage<|--MessageMetadata
+
+
+%%%
+
+
+MessageMetadata<|--QuoteReply
+MessageMetadata<|--MessageSource
+
+
+%%
+
+MessageSource<|--OnlineMessageSource
+MessageSource<|--OfflineMessageSource
+
+MessageContent<|--PlainText
+MessageContent<|--Image
+MessageContent<|--At
+MessageContent<|--AtAll
+MessageContent<|--Face
+MessageContent<|--ForwardMessage
+
+MessageContent<|--HummerMessage
+HummerMessage<|--PokeMessage
+HummerMessage<|--VipFace
+HummerMessage<|--FlashImage
+
+MessageContent<|--RichMessage
+RichMessage<|--ServiceMessage
+RichMessage<|--LightApp
+
+
+MessageContent<|--PttMessage
+PttMessage<|--Voice
+```