Add Threat modeling for builders, Threat Composer

[miiiak]

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[szh]

I really like this. Just one lint error:

cheatsheets/Threat_Modeling_Cheat_Sheet.md:143:276 MD009/no-trailing-spaces Trailing spaces [Expected: 0 or 2; Actual: 1]

[miiiak]

Lint fix is in

[szh]

LGTM, thank you!