Add NuGet.config, packages.config, and restore-packages script

NuGet.Config

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+	<config>
+		<!-- directory where the nuget packages in this repository will be installed -->
+		<add key="repositoryPath" value="packages" />
+	</config>
+	<packageRestore>
+		<add key="enabled" value="true" />
+		<add key="automatic" value="true" />
+	</packageRestore>
+	<packageSources>
+		<add key="Nuget" value="https://api.nuget.org/v3/index.json" />
+	</packageSources>
+</configuration>

packages.config

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+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+<!-- When this is updated, we want to update package version in README and the projects that reference this package.-->
+  <package id="Microsoft.googletest.v140.windesktop.msvcstl.dyn.rt-dyn" version="1.8.1.3" targetFramework="native" />
+  <package id="CMake-win64" version="3.15.5"/>
+</packages>

restore-packages.cmd

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+SET EnlRoot=%~dp0
+nuget restore %EnlRoot%packages.config -PackagesDirectory %EnlRoot%packages

restore-packages.sh

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+#!/bin/bash
+
+# Install unixodbc-dev for development headers
+#
+apt-get -q -y install unixodbc-dev
+
+apt-get update -y
+apt-get install build-essential software-properties-common -y
+add-apt-repository ppa:ubuntu-toolchain-r/test -y 
+apt-get update -y
+apt-get install gcc-7 g++-7 -y 
+update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 70 --slave /usr/bin/g++ g++ /usr/bin/g++-7
+
+exit $?
+