execute_command
Execute a command in the specified shell (powershell, cmd, or gitbash)
Example usage (PowerShell):
```json
{
"shell": "powershell",
"command": "Get-Process | Select-Object -First 5",
"workingDir": "C:\Users\username"
}
```
Example usage (CMD):
```json
{
"shell": "cmd",
"command": "dir /b",
"workingDir": "C:\Projects"
}
```
Example usage (Git Bash):
```json
{
"shell": "gitbash",
"command": "ls -la",
"workingDir": "/c/Users/username"
}
```