Add protected area

[KaiSchnepf]

Description of the issue

protected area needs to be added.

Ideas of solution

Derived from IUCN:
Protected area is a two-dimensional spatial region recognised, dedicated and managed, through legal or other effective means, to achieve the long term conservation of nature with associated ecosystem services and cultural values.

Workflow checklist

• I discussed the issue with someone else than me before working on a solution
• I already read the latest version of the workflow for this repository
• The goal of this ontology is clear to me

I am aware that

• every entry in the ontology should have a definition
• classes should arise from concepts rather than from words

[l-emele]

I agree, with a minor change: A protected area is a two-dimensional spatial region recognised, dedicated and managed, through legal or other effective means, to achieve the long term conservation of nature with associated ecosystem services and cultural values.