Update README.md after repository rename

[hdamker]

What type of PR is this?

• cleanup

What this PR does / why we need it:

Updates all references from DeviceQualityIndicator to DeviceMediaStreamingRate in README.md after the repository rename. This includes badge URLs, heading, and description text.

Which issue(s) this PR fixes:

Fixes #13
Related to camaraproject/APIBacklog#296

Special notes for reviewers:

Straightforward find-and-replace of the old repository name. No content changes beyond the name.

Changelog input

 release-note
n/a

Additional documentation

This section can be blank.

docs

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	2		0	0.01s
✅ API	spectral	1		0	1.4s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	secretlint	yes		no	0.56s
✅ YAML	yamllint	1		0	0.33s

See detailed report in MegaLinter reports

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[hdamker]

@camaraproject/device-media-streaming-rate_codeowners I removed the further needed updates from this PR. It is now a straightforward search/replace to align with the new repository name. Will merge it to eliminate the drift.