Provide auto-start scripts for Windows

We are providing a Windows executable, but it has to be started manually after each reboot. The goal of this issue is to provide some scripts or tools to auto-start FlareSolverr. The simplest way will be to create 2 .bat scripts and distribute them in the executable zip.

• install_autostart.bat => configure flaresolverr autostart. there are several ways in Windows. eg => https://answers.microsoft.com/en-us/windows/forum/windows_10-start-winpc/autostart-a-program-in-windows-10/940682ae-8872-47ce-964d-8b1e820d9a5a
• uninstall_autostart.bat => undo the previous changes in the system

PRs are welcome