Mention community project Broker for Nezha (#89)

docs/en_US/case/case7.md

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+# Broker for Nezha - Advancing on more platforms
+Contributor: 
++ [uubulb](https://github.com/uubulb)
+
+Broker for Nezha is a modified version of the Nezha Agent that separates data collection from gRPC reporting, enabling small devices to connect to the Nezha Dashboard.
+
+Project link: <https://github.com/uubulb/broker>
+
+Online Documentation: [Broker for Nezha](https://broker.kuzu.uk/)
+
+## Difference from Nezha Agent
+- Utilizes external data sources to report to **Nezha Dashboard**.
+- Supports configuring multiple sources and connecting to multiple Dashboards.
+- Currently supports two task types only: `TaskTypeCommand` and `TaskTypeTerminalGRPC`, implemented using SSH. Other task types are not planned.
+
+Broker for Nezha needs to be used with specific data collection software. Currently, it provides two data acquisition methods:
+1. HTTP (HTTP/1.1) - Active polling
+2. TCP - Passive collection (recommended to avoid creating new connections)
+
+For existing data collection software, refer to the project README. Due to security concerns, it's recommended to use this only in a trusted network.
+
+## Writing a Data Collector
+If you need to write your own data collector, you'll need to implement a basic HTTP server or TCP client and use a specific data format that Broker can recognize. For details, see: [Data types](https://broker.kuzu.uk/en/configuration/type/)
+
+## Examples
+<figure>
+    <img src="/images/case7/dashboard.jpg" alt="Dashboard">
+    <figcaption style="font-size: 0.9em; color: gray; text-align: center;">
+    Dashboard
+    </figcaption>
+</figure>
+<br />
+<figure>
+    <img src="/images/case7/webssh.jpg" alt="WebSSH">
+    <figcaption style="font-size: 0.9em; color: gray; text-align: center;">
+    WebSSH
+    </figcaption>
+</figure>