[C#] Implement new Concept Exercise: operator-overloading

[mikedamay]

This issue describes how to implement the operator-overloading 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 how and why to use overloaded operators.

Learning objectives

• Know how and why to use standard C# operators in your own classes
• Understand the behavior of == and !=

Out of scope

Concepts

• operator-overloading

Prerequisites

• method-overloading
• equality

Other prerequisites will depend on the story.

Resources to refer to

Hints

This documentation of operator overloading details the syntax.

After

This documentation of operator overloading details the syntax.

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]

Idea for operator-overloading (no refactoring required). Please have a look at instructions.md and Example.cs.. See PR #1905 instead.