Add ability to open repo in a remote container.

.devcontainer/Dockerfile

@@ -0,0 +1,34 @@
+#-------------------------------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See https://go.microsoft.com/fwlink/?linkid=2090316 for license information.
+#-------------------------------------------------------------------------------------------------------------
+
+FROM node:8-slim
+
+# Configure apt
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get update \
+    && apt-get -y install --no-install-recommends apt-utils 2>&1
+
+# Verify git and needed tools are installed
+RUN apt-get install -y git procps
+
+# Remove outdated yarn from /opt and install via package 
+# so it can be easily updated via apt-get upgrade yarn
+RUN rm -rf /opt/yarn-* \
+    rm -f /usr/local/bin/yarn \
+    rm -f /usr/local/bin/yarnpkg \
+    && apt-get install -y curl apt-transport-https lsb-release \
+    && curl -sS https://dl.yarnpkg.com/$(lsb_release -is | tr '[:upper:]' '[:lower:]')/pubkey.gpg | apt-key add - 2>/dev/null \
+    && echo "deb https://dl.yarnpkg.com/$(lsb_release -is | tr '[:upper:]' '[:lower:]')/ stable main" | tee /etc/apt/sources.list.d/yarn.list \
+    && apt-get update \
+    && apt-get -y install --no-install-recommends yarn
+
+# Install tslint and typescript
+RUN npm install -g tslint typescript
+
+# Clean up
+RUN apt-get autoremove -y \
+    && apt-get clean -y \
+    && rm -rf /var/lib/apt/lists/*
+ENV DEBIAN_FRONTEND=dialog

.devcontainer/devcontainer.json

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+// See https://aka.ms/vscode-remote/containers for the
+// documentation about the devcontainer.json format
+{
+	"name": "Extension Development",
+	"dockerFile": "Dockerfile",
+	"extensions": [
+		"ms-vscode.vscode-typescript-tslint-plugin"
+	]
+}