Update issue templates

.github/ISSUE_TEMPLATE/use-case-issue-template.md

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+---
+name: Use case issue template
+about: This template must be used for describing new use cases. It can be deleted
+  for general issues.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+If you are submitting a new USE CASE, please use the template below. Otherwise, delete the use case template before submitting your contribution.
+
+---
+# Use case
+Name: 
+
+Status: [Idea] ; [Under development] ; [Tested] ; [In application]
+
+
+Creator: (your name)
+
+## Stakeholders
+''Mandatory list of stakeholders experiencing the problem. When describing the stakeholder, please be as specific as possible (e.g., citizens, service provider, base register, data consumer, data producer, data publisher, program, etc.) and avoid using the term user.''
+
+## Problem statement
+''Mandatory statement of the current situation, including a description of the problem, the stakeholders experiencing the problem, and what the stakeholder(s) are expected to supply (i.e. what contextual knowledge are they expected to have available) and/or receive to resolve the problem they are experiencing.''
+
+## Existing approaches
+''References to standards and examples of established approaches with a potential for reuse in the Core Vocabulary''
+
+## Links
+''Link list to documents, data and projects this use case refers to''
+
+## Requirements
+''Mandatory information requirements suggested by this use case''
+
+* Imperative sentence starting with a verb each describing an individual task in order to solve the stated problem
+
+## Related use cases
+''Optional references to related local (refer to anchor identifier <nowiki>[[#Id...]]</nowiki>) and remote use cases (e.g. POE-WG UCs)''.
+
+## Comments
+''Optional section for editorial comments, suggestion and their interactive resolution''
+
+
+---