Add GitHub codespaces

.devcontainer/Dockerfile

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+ARG VARIANT=6.0
+FROM mcr.microsoft.com/vscode/devcontainers/dotnet:0-${VARIANT}
+
+RUN export DEBIAN_FRONTEND=noninteractive \
+    && apt-get update \
+    && apt-get install apt-transport-https dirmngr gnupg ca-certificates \
+    && apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF \
+    && echo "deb https://download.mono-project.com/repo/debian stable-buster main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list \
+    && apt-get update \
+    && apt-get -y install --no-install-recommends \
+    libfontconfig1 mono-complete

.devcontainer/devcontainer.json

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+{
+	"name": "SkiaSharp",
+	"runArgs": ["--init"],
+	"build": {
+		"dockerfile": "Dockerfile",
+		"args": { 
+			"VARIANT": "6.0",
+		}
+	},
+
+	"extensions": [
+		"ms-azuretools.vscode-docker",
+		"ms-dotnettools.csharp",
+		"ms-dotnettools.dotnet-interactive-vscode",
+		"ms-vscode.cpptools",
+		"ms-vscode.powershell",
+		"cake-build.cake-vscode",
+		"jeff-hykin.better-cpp-syntax"
+	],
+
+	"postCreateCommand": "bash .devcontainer/setup-container.sh",
+
+	"remoteUser": "vscode"
+}

.devcontainer/setup-container.sh

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+#!/usr/bin/env bash
+set -e
+
+echo "Restoring developer tools..."
+dotnet tool restore
+
+echo "Downloading latest native assets..."
+dotnet cake --target=externals-download
+
+echo "Setup complete."