Update README add more info about Bitcoin

[jolestar]

Summary

Summary about this PR

• Closes #issue

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Name	Status	Preview	Comments	Updated (UTC)
rooch-portal	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 11, 2024 8:33am
rooch-portal-v2.1	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 11, 2024 8:33am

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| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **rooch** | ⬜️ Ignored ([Inspect](https://vercel.com/rooch/rooch/HBqrwsdeStPHb6Zmg7QKizroTUrS)) | | | Sep 11, 2024 8:33am |

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Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

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