Add gedb to databases

[vinicius-lino-figueiredo]

Adds gedb, an embedded database written in pure-go, and a MongoDB-like API.

• Forge link: https://github.com/vinicius-lino-figueiredo/gedb
• pkg.go.dev: https://pkg.go.dev/github.com/vinicius-lino-figueiredo/gedb
• goreportcard.com: https://goreportcard.com/report/github.com/vinicius-lino-figueiredo/gedb

[github-actions]

Automated Quality Checks

Required checks

✅ Repo: accessible, has go.mod and SemVer release
✅ pkg.go.dev: OK
✅ Go Report Card: OK (grade unknown)

Additional checks

✅ License: MIT
✅ Maturity: repo has 5+ months of history
✅ CI/CD: GitHub Actions workflows detected
✅ README: present
⚠️ Coverage: missing from PR body

How to fix: Add a coverage service link to your PR description:

Coverage: https://app.codecov.io/gh/your-org/your-project

Popular options: [Codecov](https://codecov.io), [Coveralls](https://coveralls.io). Integrate one with your CI to track coverage automatically.


_These checks are automated and do not replace maintainer review. See [CONTRIBUTING.md](https://github.com/avelino/awesome-go/blob/main/CONTRIBUTING.md) for full guidelines._

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## PR Diff Validation

### Content checks

✅ **Files changed**: only README.md
✅ **Single item**: one package added
✅ **Link consistency**: README link matches forge link in PR body
✅ **Link text**: matches repository name
✅ **Description**: ends with punctuation
✅ **Description tone**: no promotional language detected
✅ **Category size**: Databases Implemented in Go has 50 items


_Automated diff validation — does not replace maintainer review._
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