[C#] Implement new Concept Exercise: namespaces

[ErikSchierboom]

This issue describes how to implement the namespaces concept exercise for the C# track.

Getting started

Please please please read the docs before starting. Posting PRs without reading these docs will be a lot more frustrating for you during the review cycle, and exhaust Exercism's maintainers' time. So, before diving into the implementation, please read up on the following documents:

• The features of v3.
• Rationale for v3.
• What are concept exercise and how they are structured?

Please also watch the following video:

• The Anatomy of a Concept Exercise.

Goal

The goal of this exercise is to teach the student the Concept of Namespaces in C#.

Learning objectives

• Know what namespaces are.
• Know how to import namespaces.

Out of scope

• Assemblies.

Concepts

This Concepts Exercise's Concepts are:

• namespaces: know what namespaces are; know how to import namespaces.
• accessibility: know how to use access modifiers to limit access to elements.

Prequisites

This Concept Exercise's prerequisites Concepts are:

• basics: know how to define a static class and static method.
• classes: know how to define a class and what the public and private access modifiers are.
• inheritance: know about the protected access modifier.

Any data types used in this exercise (e.g. strings) should also be added as prerequisites.

Resources to refer to

Hints

• Namespaces: how to define and import namespaces.
• Accessibility levels: use the public/internal/private access modifiers.

After

• Namespaces: how to define and import namespaces.
• Accessibility levels: use the public/internal/private access modifiers.

Representer

This exercise does not require any specific representation logic to be added to the representer.

Analyzer

This exercise does not require any specific analyzer logic to be added to the analyzer.

Implementing

To implement this exercise, please follow these instructions.

Help

If you have any questions while implementing the exercise, please post the questions as comments in this issue.

[mikedamay]

Perhaps we could start with a nested type situation and then refactor that to use a namespace instead.

[ErikSchierboom]

Yep, that could work!

[mikedamay]

Closed with PR #1987