Add initial codespace files

.devcontainer/Dockerfile

@@ -0,0 +1,19 @@
+FROM mcr.microsoft.com/vscode/devcontainers/dotnetcore:3.1
+
+RUN apt-get update \
+    && export DEBIAN_FRONTEND=noninteractive \
+    && apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF \
+    && echo "deb https://download.mono-project.com/repo/ubuntu stable-bionic main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list \
+    && curl -L https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add - \
+    && echo "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-10 main" | tee /etc/apt/sources.list.d/llvm.list \
+    && apt-get update \
+    && apt-get -y install --no-install-recommends \
+      python \
+      gnupg \
+      ca-certificates \
+      mono-devel \
+      libfontconfig1-dev \
+      clang-10 \
+      msbuild
+
+ENV CC=clang-10 CXX=clang++-10

.devcontainer/devcontainer.json

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+{
+	"name": "SkiaSharp",
+	"build": {
+		"dockerfile": "Dockerfile",
+	},
+
+	// Set *default* container specific settings.json values on container create.
+	"settings": {
+		"terminal.integrated.shell.linux": "/bin/bash"
+	},
+
+	// Add the IDs of extensions you want installed when the container is created.
+	"extensions": [
+		"ms-dotnettools.csharp"
+	],
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [5000, 5001],
+
+	// [Optional] To reuse of your local HTTPS dev cert, first export it locally using this command:
+	//  * Windows PowerShell:
+	//     dotnet dev-certs https --trust; dotnet dev-certs https -ep "$env:USERPROFILE/.aspnet/https/aspnetapp.pfx" -p "SecurePwdGoesHere"
+	//  * macOS/Linux terminal:
+	//     dotnet dev-certs https --trust; dotnet dev-certs https -ep "${HOME}/.aspnet/https/aspnetapp.pfx" -p "SecurePwdGoesHere"
+	//
+	// Next, after running the command above, uncomment lines in the 'mounts' and 'remoteEnv' lines below,
+	// and open / rebuild the container so the settings take effect.
+	//
+	"mounts": [
+		// "source=${env:HOME}${env:USERPROFILE}/.aspnet/https,target=/home/vscode/.aspnet/https,type=bind"
+	],
+	"remoteEnv": {
+		// "ASPNETCORE_Kestrel__Certificates__Default__Password": "SecurePwdGoesHere",
+		// "ASPNETCORE_Kestrel__Certificates__Default__Path": "/home/vscode/.aspnet/https/aspnetapp.pfx",
+	}
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "dotnet restore",
+
+	// Uncomment to connect as a non-root user. See https://aka.ms/vscode-remote/containers/non-root.
+	// "remoteUser": "vscode"
+}