translation ptbr.md

[luizpeixe2]

Translation for Mapping Techniques wiki page to Portuguese (Brazil)

Self-check

• The changes are tested against the contribution checklist
• (translations only) The changes are reviewed on GitHub by a fluent speaker

[Walavouchey]

hello, when making translations, you should create a new file instead of modifying the english article. (create pt-br.md in this case)

[github-actions]

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