Add market share and market share value

[chrwm]

Summary of the discussion

I added the terms to the shared-axioms-module.

Type of change (CHANGELOG.md)

Add

• Added market share
• Added market share value

Workflow checklist

Automation

Closes #1636

PR-Assignee

• 🐙 Follow the Pull Request Workflow
• 📝 Update the CHANGELOG.md
• 📙 Add #'s to term tracker item

Reviewer

• 🐙 Follow the Reviewer Guide
• 🐙 Provided feedback and show sufficient appreciation for the work done

[stap-m]

I added the terms to the shared-axioms-module.

This module is only for axioms across modules! Is there a reason, why not oeo-social?

[chrwm]

I added the terms to the shared-axioms-module.

This module is only for axioms across modules! Is there a reason, why not oeo-social?

No, it seemed for me that in the future it might intertwine with other concepts of other modules.
However, I can move it over to oeo-social for now.

[stap-m]

I added the terms to the shared-axioms-module.

This module is only for axioms across modules! Is there a reason, why not oeo-social?

No, it seemed for me that in the future it might intertwine with other concepts of other modules. However, I can move it over to oeo-social for now.

In that case, the axioms will be implemented in oeo-shared-axioms, but the classes should stay at their "home module".