mm/.github/pull_request_template.md

Before opening this PR, ensure the following:

• ./format.sh was run to apply standard formatting.
• make successfully builds a matching ROM.
• No new compiler warnings were introduced during the build process.
  • Can be verified locally by running tools/warnings_count/check_new_warnings.sh
• New variables & functions should follow standard naming conventions.
• Comments and variables have correct spelling.

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