add examples

[plebhash]

I feel this was quite useful to help me get started with this crate

https://github.com/rustaceanrob/bitcoin-ipc/blob/mining/example/mining.rs

[Sjors]

Do you think that's still useful now that we have test coverage?

[plebhash]

what inspired me to create this issue was trying to explain this crate to @johnnyasantoss

since he's coming at this with fresh eyes, maybe he can check the examples vs tests and weigh in?

[rustaceanrob]

FWIW I always look in the examples folder when using a new crate. Even if just duplication from the test suite, I think it would be nice to have a standard example.

[Sjors]

Sounds reasonable.

[Sjors]

^ let's see if copilot can do it in one shot.

[Sjors]

Narrator: kind of

For now consider this up for grabs, feel free to use #18.