Add configuration for VSCode's Remote Container development

.devcontainer/Dockerfile

@@ -0,0 +1,20 @@
+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.148.1/containers/go/.devcontainer/base.Dockerfile
+
+# [Choice] Go version: 1, 1.15, 1.14
+ARG VARIANT="1"
+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 "source /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 libtag1-dev ffmpeg
+
+# [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