Update README.md

[mariamhas]

update description, added more installation options and contribution

Replace this paragraph with a description of what this PR is changing or adding, and why. Consider including before/after screenshots.

List which issues are fixed by this PR. You must list at least one issue.

If you had to change anything in the flutter/tests repo, include a link to the migration guide as per the breaking change policy.

Pre-launch Checklist

• [x ] I read the Contributor Guide and followed the process outlined there for submitting PRs.
• [x ] I read the Tree Hygiene wiki page, which explains my responsibilities.
• [ x] I read the Flutter Style Guide recently, and have followed its advice.
• [ x] I signed the CLA.
• [ x] I listed at least one issue that this PR fixes in the description above.
• [ x] I updated/added relevant documentation (doc comments with ///).
• [ x] I added new tests to check the change I am making, or this PR is test-exempt.
• [x ] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel on Discord.

[gemini-code-assist]

Code Review

This pull request updates the README.md to rename the project, provide a more detailed explanation of Flutter Agent Skills and their relationship to MCP, and include additional installation options. It also updates the contribution guidelines to state that pull requests are not currently being accepted. A review comment pointed out a minor typographical error in the description that needs to be addressed.