Fix placeholder clone URL in root README

[observerr411]

• Location: README.md:68
• Problem: Clone instructions reference a placeholder repository URL (yourusername/...).
• Resolution criteria: Replace with the real repository URL or provide a neutral template with clear placeholder labeling.

[Itodo-S]

@Itodo-S has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

please let me work on this issue; i can handle it

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