Add devcontainer configuration

.devcontainer/Dockerfile

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+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.183.0/containers/go/.devcontainer/base.Dockerfile
+
+# [Choice] Go version: 1, 1.16, 1.15
+ARG VARIANT="1.16"
+FROM mcr.microsoft.com/vscode/devcontainers/go:0-${VARIANT}
+
+# [Option] Install Node.js
+ARG INSTALL_NODE="true"
+ARG NODE_VERSION="lts/*"
+RUN if [ "${INSTALL_NODE}" = "true" ]; then su vscode -c "umask 0002 && . /usr/local/share/nvm/nvm.sh && nvm install ${NODE_VERSION} 2>&1"; fi
+
+# [Optional] Uncomment this section to install additional OS packages.
+# RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+#     && apt-get -y install --no-install-recommends <your-package-list-here>
+
+# [Optional] Uncomment the next line to use go get to install anything else you need
+# RUN go get -x <your-dependency-or-tool>
+
+# [Optional] Uncomment this line to install global node packages.
+# RUN su vscode -c "source /usr/local/share/nvm/nvm.sh && npm install -g <your-package-here>" 2>&1

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.183.0/containers/go
+{
+	"name": "Go",
+	"build": {
+		"dockerfile": "Dockerfile",
+		"args": {
+			// Update the VARIANT arg to pick a version of Go: 1, 1.16, 1.15
+			"VARIANT": "1.16",
+			// Options
+			"INSTALL_NODE": "false",
+			"NODE_VERSION": "lts/*"
+		}
+	},
+	"runArgs": [ "--cap-add=SYS_PTRACE", "--security-opt", "seccomp=unconfined" ],
+
+	// Set *default* container specific settings.json values on container create.
+	"settings": {
+		"go.toolsManagement.checkForUpdates": "local",
+		"go.useLanguageServer": true,
+		"go.gopath": "/go",
+		"go.goroot": "/usr/local/go"
+	},
+
+	// Add the IDs of extensions you want installed when the container is created.
+	"extensions": [
+		"golang.Go"
+	],
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "go version",
+
+	// Comment out connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+	"remoteUser": "vscode"
+}

.vscode/extensions.json

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+{
+  "recommendations": [
+		"golang.Go"
+  ]
+}

.vscode/settings.json

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+{
+  "go.toolsManagement.checkForUpdates": "local",
+  "go.useLanguageServer": true,
+  "go.gopath": "/go",
+  "go.goroot": "/usr/local/go"
+}