Create ISSUE_TEMPLATE.md

Author: bobbrow

ISSUE_TEMPLATE.md

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+<!--
+  If this is a bug report, please give us as much information as possible so we can reproduce your issue.
+  Examples of information that can help us find and fix bugs:
+    * Operating System and version
+    * VS Code version and if you are using the Insider build
+    * C/C++ extension version
+    * Other extensions you installed and if the issue persists after disabling them
+    * step-by-step instructions to reproduce the issue
+    * A small code sample, zipped up project, or open source repo we can use to verify the bug
+    * Relevant settings from your settings.json, c_cpp_properties.json, and/or launch.json files
+
+  Please also take a look at our documentation, as we may already have answers for your questions:
+    * https://github.com/Microsoft/vscode-cpptools/tree/master/Documentation
+
+  Thank you!
+-->