Document HTTP API changes

docs/http/index.md

@@ -16,18 +16,38 @@ The HTTP API is how emails are sent from Continuous Integration environments.
 |to|string|true|
 |subject|string|true|
 |body|string|false|
+|attachments|array|false|
+
+#### Attachments
+
+|name|type|required|description|
+|---|---|---|
+|type|string|true|The content's MIME type|
+|content|string|true|The Base64 encoded content of the attachment|
+|filename|string|true|The attachment's filename|
 
 ### Example
 
 #### application/x-www-form-urlencoded
 ```bash
 curl --request POST 'https://www.cinotify.cc/api/notify' \
-  -d "[email protected]&subject=building main&body=hello."
+  -d "[email protected]&subject=building main&body=hello.&attachments[][type]=text/plain&attachments[][content]=aGVsbG8sIHdvcmxkIQ==&attachments[][filename]=hello.txt"
 ```
 
 #### json
 ```bash
 curl -X POST 'https://www.cinotify.cc/api/notify' \
   -H "Content-Type: application/json" \
-  -d '{"to":"[email protected]", "subject": "building main", "body":"hello."}'
+  -d '{
+    "to": "[email protected]",
+    "subject": "building main",
+    "body": "hello.",
+    "attachments": [
+      {
+        "type": "text/plain",
+        "content": "aGVsbG8sIHdvcmxkIQ==",
+        "filename": "hello.txt"
+      }
+    ]
+  }'
 ```