Adding sample files

.devcontainer/Dockerfile

@@ -0,0 +1,20 @@
+#-----------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See LICENSE in the project root for license information.
+#-----------------------------------------------------------------------------------------
+
+FROM php:7-cli
+
+# Install xdebug
+RUN yes | pecl install xdebug \
+	&& echo "zend_extension=$(find /usr/local/lib/php/extensions/ -name xdebug.so)" > /usr/local/etc/php/conf.d/xdebug.ini \
+	&& echo "xdebug.remote_enable=on" >> /usr/local/etc/php/conf.d/xdebug.ini \
+	&& echo "xdebug.remote_autostart=on" >> /usr/local/etc/php/conf.d/xdebug.ini
+
+# Install git, process tools
+RUN apt-get update && apt-get -y install git procps
+
+# Clean up
+RUN apt-get autoremove -y \
+    && apt-get clean -y \
+    && rm -rf /var/lib/apt/lists/*