Add key features

[ErikSchierboom]

This issue is part of the migration to v3. You can read full details about the various changes here.

In Exercism v3, each track must specify exactly six "key features". Exercism uses these features to highlight the most interesting, unique or "best" features of a language to a student.

Key features are specified in the top-level "key_features" field in the track's config.json file and are defined as an array of objects, as specified in the spec.

Goal

The "key_features" field in the config.json file should be updated to describe the six "key features" of this track. See the spec.

Example

{
  "key_features": [
    {
      "icon": "features-oop",
      "title": "Modern",
      "content": "C# is a modern, fast-evolving language."
    },
    {
      "icon": "features-strongly-typed",
      "title": "Cross-platform",
      "content": "C# runs on almost any platform and chipset."
    },
    {
      "icon": "features-functional",
      "title": "Multi-paradigm",
      "content": "C# is primarily an object-oriented language, but also has lots of functional features."
    },
    {
      "icon": "features-lazy",
      "title": "General purpose",
      "content": "C# can be used for a wide variety of workloads, like websites, console applications, and even games."
    },
    {
      "icon": "features-declarative",
      "title": "Tooling",
      "content": "C# has excellent tooling, with linting and advanced refactoring options built-in."
    },
    {
      "icon": "features-generic",
      "title": "Documentation",
      "content": "Documentation is excellent and exhaustive, making it easy to get started with C#."
    }
  ]
}

Tracking

exercism/v3-launch#5

[gamebox]

Seems like this done:

dart/config.json

Lines 659 to 690 in 0114ac3

	"key_features": [
	{
	"icon": "web",
	"title": "Web and Mobile",
	"content": "Dart has the Flutter library, which can be used to quickly build web and smartphone applications."
	},
	{
	"icon": "portable",
	"title": "iOS and Android",
	"content": "Dart can be converted into Swift and Kotlin, making mobile development fast and efficient."
	},
	{
	"icon": "documentation",
	"title": "Full Documentation",
	"content": "Dart's learning materials are constantly updated, making it easy to look up information."
	},
	{
	"icon": "community",
	"title": "Countless Packages",
	"content": "Easily build and publish packages for public use, which can be accessed from Dart directly."
	},
	{
	"icon": "functional",
	"title": "Highly-organized Code",
	"content": "Dart's coding style makes it easy to read and understand."
	},
	{
	"icon": "fun",
	"title": "Easy to Learn",
	"content": "Dart is easy to understand and great for beginners to programming."
	}
	],