Resolves: Add GitHub Codespaces configuration

[aleks-ivanov]

• ready-to-start GitHub Codespaces configuration with all necessary tooling

• in addition, it provides basic tools for:

  • .NET development
  • GitHub support
  • overall more pleasant VS Code experience

The configuration consists of:

• "settings": - a list of VS Code settings to be applied automatically after the Codespace container is created (.editorconfig overrides these)

  • "workbench.colorTheme": "Default Dark+" - sets the theme of the VS Code workbench to the Default Dark+ theme
  • "terminal.integrated.defaultProfile.linux": "pwsh" - sets the default VS Code terminal to PowerShell Core

• extensions: - a list of VS Code extensions that are automatically installed after the Codespace container is created

  • "coenraads.bracket-pair-colorizer" - sets different colors for each nested pair of brackets
  • "vscode-icons-team.vscode-icons" - provides a huge set of icons for the VS Code explorer
  • "editorconfig.editorconfig" - attempts to override user/workspace settings with those in the .editorconfig
  • "eamodio.gitlens" - provides git information directly inside the code
  • "cschleiden.vscode-github-actions" and "redhat.vscode-yaml" - provide YAML and GitHub Actions support
  • "bierner.markdown-preview-github-styles" and "ban.spellright" - provide assistance with writing Markdown documentation
  • "ms-dotnettools.csharp" and "VisualStudioExptTeam.vscodeintellicode" - provide basic Visual Studio tooling
  • "ms-vscode.powershell" - provides the functionality of Windows PowerShell ISE inside VS Code
  • "jmrog.vscode-nuget-package-manager" - provides use of the NuGet library through the Command Palette

• "postCreateCommand" - is a string of commands separated by && that execute after the container has been built and the source code has been cloned

• "build" - declares the Docker configuration that the container would use to run.

• Dockerfile:

  • "mcr.microsoft.com/vscode/devcontainers/dotnet:0.201.9-5.0" - the Codespace container runs from an Ubuntu 20.04 image with .NET Core SDK installed (0.201.7 is the latest .NET Core SDK Docker image tagged version)
  • Additional installed tools:
    • .NET Core SDK 3.1

This GitHub Codespace configuration can also be used locally with the Remote - Containers extension for VS Code. It automatically creates and runs a Docker container based on the devcontainer.json configuration inside the repo, so anyone could work on the project from any computer, without the need to install anything other than VS Code and Docker.

Additional code change in src/TestTargets/Types/Types.csproj is because of this error:

/workspaces/clrmd/src/TestTargets/Types/obj/Debug/netcoreapp3.1/Types.AssemblyInfo.cs(15,12): error CS0579: Duplicate 'System.Reflection.AssemblyFileVersionAttribute' attribute [/workspaces/clrmd/src/TestTargets/Types/Types.csproj]
/workspaces/clrmd/src/TestTargets/Types/obj/Debug/netcoreapp3.1/Types.AssemblyInfo.cs(19,12): error CS0579: Duplicate 'System.Reflection.AssemblyVersionAttribute' attribute [/workspaces/clrmd/src/TestTargets/Types/Types.csproj]

Resolves #939