feat(add “Build with Theta”): Add “Build with Theta” in “Backend-Driv…

[andreabuttarelli]

…en” category

Description

Hi, this is Andrea, I would like to propose "Build with Theta" as a new resource under the “Backend-driven” category.

• Repo: https://github.com/buildwiththeta/buildwiththeta
• Pub.dev: https://pub.dev/packages/theta

Please read How to contribute before creating a submission.

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Checklist

• I read How to contribute
• I edited the SOURCE.md file only
• Added a link to the repo in the PR

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