Impersonation example for Linux

[lxwang42]

Hello! would you mind to add an impersonation example for Linux?

[Nisitay]

Hey :)

If you're on Linux, you should be able to use any library that can alter packets on the fly (for example: NetFilterQueue).

I will attempt to implement it myself and update the examples accordingly.

[Nisitay]

Sorry for the late response, I haven't had much time lately to test this myself. Thankfully, @momo286 added an example for linux impersonation in this PR. Let me know if you have any questions!