Add zerohand to DevOps Tools section (#6294)

Author: nilpoona

README.md

@@ -3507,6 +3507,7 @@ _Software written in Go._
 - [wait-for](https://github.com/dnnrly/wait-for) - Wait for something to happen (from the command line) before continuing. Easy orchestration of Docker services and other things.
 - [Wide](https://wide.b3log.org/login) - Web-based IDE for Teams using Golang.
 - [winrm-cli](https://github.com/masterzen/winrm-cli) - Cli tool to remotely execute commands on Windows machines.
+- [zerohand](https://github.com/nilpoona/zerohand) - A simple and efficient load testing tool for Web APIs.
 
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