Add *Rabbit source connector guide* (apache#5255)

site2/docs/io-rabbitmq-source.md

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+---
+id: io-rabbitmq
+title: RabbitMQ source connector
+sidebar_label: RabbitMQ source connector
+---
+
+The RabbitMQ source connector receives messages from RabbitMQ clusters 
+and writes messages to Pulsar topics.
+
+## Configuration 
+
+The configuration of the RabbitMQ source connector has the following properties.
+
+### Property
+
+| Name | Type|Required | Default | Description 
+|------|----------|----------|---------|-------------|
+| `connectionName` |String| true | " " (empty string) | The connection name. |
+| `host` | String| true | " " (empty string) | The RabbitMQ host. |
+| `port` | int |true | 5672 | The RabbitMQ port. |
+| `virtualHost` |String|true | / | The virtual host used to connect to RabbitMQ. |
+| `username` | String|false | guest | The username used to authenticate to RabbitMQ. |
+| `password` | String|false | guest | The password used to authenticate to RabbitMQ. |
+| `queueName` | String|true | " " (empty string) | The RabbitMQ queue name that messages should be read from or written to. |
+| `requestedChannelMax` | int|false | 0 | The initially requested maximum channel number. <br><br>0 means unlimited. |
+| `requestedFrameMax` | int|false |0 | The initially requested maximum frame size in octets. <br><br>0 means unlimited. |
+| `connectionTimeout` | int|false | 60000 | The timeout of TCP connection establishment in milliseconds. <br><br>0 means infinite. |
+| `handshakeTimeout` | int|false | 10000 | The timeout of AMQP0-9-1 protocol handshake in milliseconds. |
+| `requestedHeartbeat` | int|false | 60 | The requested heartbeat timeout in seconds. |
+| `prefetchCount` | int|false | 0 | The maximum number of messages that the server delivers.<br><br> 0 means unlimited. |
+| `prefetchGlobal` | boolean|false | false |Whether the setting should be applied to the entire channel rather than each consumer. |
+
+### Example
+
+Before using the RabbitMQ source connector, you need to create a configuration file through one of the following methods.
+
+* JSON 
+
+    ```json
+    {
+        "host": "localhost",
+        "port": "5672",
+        "virtualHost": "/",
+        "username": "guest",
+        "password": "guest",
+        "queueName": "test-queue",
+        "connectionName": "test-connection",
+        "requestedChannelMax": "0",
+        "requestedFrameMax": "0",
+        "connectionTimeout": "60000",
+        "handshakeTimeout": "10000",
+        "requestedHeartbeat": "60",
+        "prefetchCount": "0",
+        "prefetchGlobal": "false"
+    }
+    ```
+
+* YAML
+
+    ```yaml
+    configs:
+        host: "localhost"
+        port: 5672
+        virtualHost: "/",
+        username: "guest"
+        password: "guest"
+        queueName: "test-queue"
+        connectionName: "test-connection"
+        requestedChannelMax: 0
+        requestedFrameMax: 0
+        connectionTimeout: 60000
+        handshakeTimeout: 10000
+        requestedHeartbeat: 60
+        prefetchCount: 0
+        prefetchGlobal: "false"
+    ```
+