Sweep: update the readme to include a description of what this repo does

[MartinYe1234]

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[sweep-nightly[bot]]

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Step 1: 🔎 Searching

(Click to expand) Here are the code search results. I'm now analyzing these search results to write the PR.

https://github.com/sweepai/sweep/blob/34b4c37db109c92fad9da526a26b17be0253b90a/README.md#L1-L117

https://github.com/sweepai/sweep/blob/34b4c37db109c92fad9da526a26b17be0253b90a/sweepai/utils/ticket_rendering_utils.py#L1-L812

Step 2: ⌨️ Coding

I'm going to follow the following steps to help you solve the GitHub issue:

1. Add a "Story" section to the README that explains the motivation behind creating Sweep.
2. Add a "Features" section to the README that highlights the key capabilities of Sweep.
3. Add a screenshot or demo video to the README showing Sweep in action.

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