[bisq-network/bisq] Add front matter to issue_template.md (#5352)

[huey735]

I added semanticly relevant front matter to the issue_template.md
so that it explicit that it should be reserved for reporting bugs
or unintentional behaviours from the software.

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Fixes #replaceWithIssueNr, fixes #replaceWithIssueNr
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You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/5352

-- Commit Summary --

  * Add front matter to issue_template.md

-- File Changes --

    M .github/ISSUE_TEMPLATE/ISSUE_TEMPLATE.md (6)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/5352.patch
https://github.com/bisq-network/bisq/pull/5352.diff

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