Sweep: write a readme

[sweep-ai[bot]]

Sweep is currently not supported on empty repositories. Please add some code to your repository and try again.

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Step 1: 📍 Planning

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🎉 Latest improvements to Sweep:

• Getting Sweep to run linters before committing! Check out Sweep Sandbox Configs to set it up.
• Added support for self-hosting! Check out Self-hosting Sweep to get started.
• [Self Hosting] Multiple options to compute vector embeddings, configure your .env file using VECTOR_EMBEDDING_SOURCE

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