Add API Usage Examples

[Abd-Standard]

Description:
Provide practical API examples showing common NotifyChain workflows.

Include:

Creating notifications.
Scheduling notifications.
Querying event history.
Checking delivery status.
Handling API errors.

[mrtandmilo]

@mrtandmilo has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

Let me take this off your hands ASAP

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

[Daluworks]

@Daluworks has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

I am skilled enough to solve this having worked on something similar in the past. Please assign

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

[pelumixxril]

@pelumixxril has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

Hi maintainer,I would love to work on this issue,please assign it to me

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

[AugistineCreates]

@AugistineCreates has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

Hi, I’d like to work on this issue. I’ve reviewed the requirements and would be happy to take it on. Please assign it to me. Thank you!

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

[flare-999]

@flare-999 has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

I'm interested on working on this issue,i have worked on similar issues and delivered good pr.
please assign this to me.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @flare-999 to this issue.

[drips-wave]

Congratulations, @pelumixxril! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on September 30, 2026.

🧑‍💻 @pelumixxril: 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.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊