Add devcontainer definition

Content/.devcontainer/Dockerfile

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+FROM mcr.microsoft.com/dotnet/core/sdk:2.2
+
+# Add keys and sources lists
+RUN curl -sL https://deb.nodesource.com/setup_11.x | bash
+RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
+RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" \
+    | tee /etc/apt/sources.list.d/yarn.list
+
+# Install node, 7zip, yarn, git, process tools
+RUN apt-get update && apt-get install -y nodejs p7zip-full yarn git procps
+
+# Clean up
+RUN apt-get autoremove -y \
+    && apt-get clean -y \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install fake
+RUN dotnet tool install fake-cli -g
+
+# Install Paket
+RUN dotnet tool install paket -g
+
+# add dotnet tools to path to pick up fake and paket installation
+ENV PATH="/root/.dotnet/tools:${PATH}"
+
+# Copy endpoint specific user settings into container to specify
+# .NET Core should be used as the runtime.
+COPY settings.vscode.json /root/.vscode-remote/data/Machine/settings.json

Content/.devcontainer/devcontainer.json

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+{
+	"name": "SAFE",
+	"dockerFile": "Dockerfile",
+	"appPort": [8080, 8085],
+	"extensions": [
+		"ionide.ionide-fsharp",
+        "ms-vscode.csharp",
+        "editorconfig.editorconfig",
+        "msjsdiag.debugger-for-chrome"
+	]
+}

Content/.devcontainer/settings.vscode.json

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+{
+    "FSharp.fsacRuntime":"netcore"
+}