Add ChatMessage context

docs/context/ref/ChatMessage.md

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+---
+id: ChatMessage
+sidebar_label: ChatMessage
+title: ChatMessage
+hide_title: true
+---
+# `ChatMessage`
+
+Message to send to a chat.
+
+## Type
+
+`fdc3.chat.message`
+
+## Schema
+
+- https://fdc3.finos.org/schemas/next/chatMessage.schema.json
+
+## Details
+
+| Property    | Type    | Required | Example Value     |
+|-------------|---------|----------|-------------------|
+| `type`      | string  | Yes      | `'fdc3.chat.message'`  |
+| `chatRoom`      | ChatRoom  | Yes       | `{ type: 'fdc3.chat.room', providerName: 'Symphony', id:{ roomdId: 'j75xqXy25NBOdacUI3FNBH'} }`      |
+| `message`  | [Message](https://fdc3.finos.org/schemas/next/message.schema.json)  | Yes       | `'A message to send'` |
+
+## Example
+
+```js
+const chatMessage = {
+    type: "fdc3.chat.message",
+    chatRoom: {
+        type: 'fdc3.chat.room',
+        providerName: "Symphony",
+        id: {
+            roomId: "j75xqXy25NBOdacUI3FNBH"
+        }
+    },
+    message: "A message to send"
+}
+```
+
+## See Also
+
+Intents
+- [StartChat](../../intents/ref/StartChat)
+- [StartCall](../../intents/ref/StartCall)
+- [SendChatMessage](../../intents/ref/SendChatMessage)
+
+FINOS Financial Objects
+- [Contact](https://fo.finos.org/docs/objects/contact)

website/static/schemas/next/chatMessage.schema.json

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+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "$id": "https://fdc3.finos.org/schemas/next/chatMessage.schema.json",
+  "type": "object",
+  "title": "ChatMessage",
+  "allOf": [{ "$ref": "context.schema.json#" }],
+  "properties": {
+    "type": { "const": "fdc3.chat.message" },
+    "chatRoom": { "$ref": "chatRoom.schema.json#" },
+    "message": { "$ref": "message.schema.json#" }
+  },
+  "required": ["type", "chatRoom", "message"]
+}