Add GitHub release creation tool and documentation

[xingzihai]

This PR addresses issue #1000 by adding a helper script and documentation for creating GitHub releases.

Changes

1. Added tools/create-github-release.sh - A helper script to create GitHub releases from existing git tags
2. Updated README.md with new Releases section

Issue

Fixes kubernetes/cloud-provider-gcp #1000

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: xingzihai
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