[bisq-network/bisq] Extend CONTRIBUTING.md with info on IDEA settings (#4239)

[cd2357]

Add a link to a StackOverflow answer showing how to configure IDEA to
automatically check and enforce the format of the commit message.

More specifically, the 50-character limit for the commit title and
72-character limit for the commit body.
You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/4239

-- Commit Summary --

  * Extend CONTRIBUTING.md with info on IDEA settings

-- File Changes --

    M CONTRIBUTING.md (6)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/4239.patch
https://github.com/bisq-network/bisq/pull/4239.diff

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