PullRequest.md

What this PR is changing:

This PR updates the cupertino_icons README.md to include the Cupertino Icons Gallery which contains over 1,335 Cupertino Icons used in Flutter with intelligent searching, filtering and code snippets of Cupertino Icons.

Why the PR:

Since the Old Cupertino Icons Gallery is no longer up, most Flutter Devs including me have been facing challenges in accessing Cupertino Icons. So this PR comes to inform them about the free and open-source Cupertino Icons Gallery App.

Issues are fixed by this PR:

• This `PR fixes this issue: cupertino-icon-page-not-found

• It also answers a question listed on Stack Overflow about how-to-access-cupertino-icons-1-0-0-gallery

It doesn't have anything to change anything in the flutter/tests repo.

Screenshots of the README.md:

a) Before

b) After

Pre-launch Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I read the Tree Hygiene wiki page, which explains my responsibilities.
• I read and followed the relevant style guides and ran the auto-formatter. (Unlike the flutter/flutter repo, the flutter/packages repo does use dart format.)
• I signed the CLA.
• The title of the PR starts with the name of the package surrounded by square brackets, e.g. [shared_preferences]
• I listed at least one issue that this PR fixes in the description above.
• All existing and new tests are passing.
• I updated CHANGELOG.md to add a description of the change, following repository CHANGELOG style.

These are unchecked because no part of the codebase has been changed, it's just the README file that has been editted.

• I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy, or this PR is exempt from version changes.
• I updated/added relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or this PR is test-exempt.

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