Closes #11 Add method to track plugin activation

[remyperona]

Description

Fixes #11

Type of change

• Enhancement (non-breaking change which improves an existing functionality).

Detailed scenario

What was tested

n/a

How to test

n/a

Technical description

Documentation

Explain how this code works. Diagrams & drawings are welcome.

Mandatory Checklist

Code validation

• I validated all the Acceptance Criteria. If possible, provide screenshots or videos.
• I triggered all changed lines of code at least once without new errors/warnings/notices.
• I implemented built-in tests to cover the new/changed code.

Code style

• I wrote a self-explanatory code about what it does.
• I protected entry points against unexpected inputs.
• I did not introduce unnecessary complexity.