Suggestion on good usage of /dev/shm in README-hacking.md

When you are working with large files and there is some good RAM in the
system (large/powerful computers), it is beneficial to work in the shared
memory directory and not the actual persistent storage (like HDD or
SSD).

With this commit, a fully working demo has been added to
`README-hacking.md' (under the tips of "Make programming") to show how to
effectively work in situations like this.

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