Creating a generic trigger mechanism

[maiamiguel]

Description

In this PR I have address the following:

• Created a demo app that includes the SPM package to showcase its behaviour
• Added app assets to the demo app
• Changed documentation accordingly
• Changed the trigger mechanism to consider other types and not only Integers as before

Related Issues

Issue #36

Checklist

• Have you added tests where necessary? Do all the test pass?
• Have you added descriptive comments to your code?
• Have you updated the documentation related to this proposal

@simibac let me know what you think 🙏

[MojtabaHs]

Thanks for your contribution. This PR contains too many changes. Maybe breaking it into smaller chunks can help the owner to merge it easier.

Suggestion:

• A PR for making the trigger generic (including rename the property and updates for the docs accordingly)
• A PR for adding a demonstration of these changes (including the app and the needed assets)

[OmarJalil]

You should create the Example app inside a folder named Example, the way you added an additional folder level will cause SPM to not find the package in the project, but the change is good.