Update README files to enhance Windows terminal and PowerShell installation instructions
- Revised the section on opening the Windows Admin Terminal for clarity and consistency in both English and Chinese.
- Added detailed steps for installing PowerShell, including two methods: using Winget and manual download, with improved formatting for better readability.
- Ensured that all instructions are clear and accessible to users, enhancing the overall documentation quality.
> 💡 If you encounter any issues, please refer to the [Microsoft Official Installation Guide](https://learn.microsoft.com/en-us/powershell/scripting/install/installing-powershell-on-windows)