Add num_cpus example

[V1shvesh]

@budziq have a look
Edit: fixes #307

[budziq]

@V1shvesh the PR is almost perfect, just osme final touches

[budziq]

@V1shvesh the PR is almost perfect, just osme final touches

[budziq]

No need for error_chain as there is no possibility for error handling in this example. Lets just remove it.

[budziq]

I would rephrase that with something along the lines of:
"Shows the number of logical cpu cores with help of num_cpus::get" and I would hyperlink the symbol reference to its respective docs.rs

[V1shvesh]

I hope the heading is fine as it is.

[budziq]

also please refer the original issue in your PR text like "fixes #307" for the issue to autoclose on this PR being merged

[budziq]

merged with some minor cleanup. Thanks @V1shvesh

[V1shvesh]

@budziq I'm sorry for asking, but I'm seeing "closed pull request" instead of "merged pull request". This is fine, or not?

[budziq]

Yeah, I've pulled your changes and done some minor finish line cleaning myself and pushed them directly. Github is not able to handle this correctly so one has to close the PR by hand.

You can see your example in the gitlog (your authorship preserved) and published in rendered cookbook now 👍

[V1shvesh]

Oh, that's not a problem. My main concern is would this count as a PR for hacktoberfest?

[budziq]

No idea, sorry! But you can ask digital ocean directly. They are usually quite responsive.