Issue 24: Add second example template: token-allowlist in templates/examples/

[Nanle-code]

Labels: good first issue, templates

Description:
Only templates/examples/simple-counter/ exists.

Acceptance criteria:

Full Soroban project with placeholders {{PROJECT_NAME_PASCAL}}.
Covered by tests/template_marketplace_test.rs.
Files:

templates/examples/ (new folder)
templates/README.md
tests/template_marketplace_test.rs

[maztah1]

@maztah1 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I’d like to solve this issue please

ℹ️ Repo Maintainers: To accept this application, review their application or assign @maztah1 to this issue.

[drips-wave]

Congratulations, @maztah1! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @maztah1: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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