doc: a guide about how to use api-testing to try tRPC (#129)

close #100

@WineChord gives me a very big help. Thanks for that.

---------

Co-authored-by: Rick <linuxsuren@users.noreply.github.com>
Co-authored-by: wineandchord <guoqizhou123123@qq.com>

docs/README.md

@@ -27,6 +27,7 @@ English | [中文](README.zh_CN.md)
   - [High Performance Network Package tnet](/docs/user_guide/tnet.md)
   - [Track Running Status](/rpcz/README.md)
   - [Attachment (Big Binary Data) Transfer](/docs/user_guide/attachment.md)
+  - [Testing](/docs/user_guide/testing.md)
 - Developer Guide
   - Plugin Development
     - [Plugin Overview](/plugin/README.md)

docs/README.zh_CN.md

@@ -27,6 +27,7 @@
   - [高性能网络库 tnet](/docs/user_guide/tnet.zh_CN.md)
   - [运行状态追踪](/rpcz/README.zh_CN.md)
   - [附件（大二进制数据）传输](/docs/user_guide/attachment.zh_CN.md)
+  - [测试](/docs/user_guide/testing.zh_CN.md)
 - 开发指南
   - 插件开发
     - [插件向导](/plugin/README.zh_CN.md)

docs/user_guide/testing.md

@@ -0,0 +1,9 @@
+# tRPC-Go Testing
+
+Interface testing refers to the process in which, after the service has successfully started, verification is carried out by sending packets.
+
+## Tools
+
+* [trpc-cli](TODO)
+* [api-testing](https://github.com/linuxsuren/api-testing)
+* [eab](TODO)

docs/user_guide/testing.zh_CN.md

@@ -0,0 +1,9 @@
+# tRPC-Go Testing
+
+接口测试是指服务启动成功后，通过发送报文进行验证的过程。
+
+## 工具
+
+* [trpc-cli](TODO)
+* [api-testing](https://github.com/linuxsuren/api-testing)
+* [eab](TODO)