fix readme formatting hopefully

resources.md

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 There was some initial debate on the environment to write this on. 
 
 A large part of the decision came down to whether it was possible grab L2 data from the kernel. I wanted to grab L2 data as that would've meant the ability to implement another (lower!) layer.
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 <img src="https://upload.wikimedia.org/wikipedia/commons/a/af/Tun-tap-osilayers-diagram.png" width="500px">
 
+(https://en.wikipedia.org/wiki/TUN/TAP)
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 The following is some discoveries made along the way of making that decision:
 
 * Turns out MacOS made it impossible (since Catalina) to grab L2 data from a TAP IF, and all applications have to use L3 data from a kernel TUN.