Add GitHub issue submission template

Author: Damian Rouson

.github/ISSUE_TEMPLATE.md

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+<!-- Please fill out the issue template included below, failure to do -->
+<!-- so may result in immediate closure of your issue. -->
+
+<!-- Fill out all portions of this template that apply. Please delete -->
+<!-- any unnecessary sections. -->
+
+<!-- PRO TIP! Submit the pull request *before* you check any -->
+<!-- checkboxes. Then, use the gui/web interface to check the -->
+<!-- checkboxes! -->
+
+Please make sure to put any logs, terminal output, or code in
+[fenced code blocks]. 
+
+# Defect/Bug Report #
+
+<!-- delete this section if it does not apply -->
+The title of the issue should start with `Defect:` followed by a
+succinct title.
+
+<!-- THE FOLLOWING INFORMATION IS MANDATORY if you would like our help -->
+
+- GCC Version used to build this fork: <!-- `gcc --version` -->
+- Output of `uname -a`:
+- Machine architecture and number of physical cores:
+
+## Observed Behavior ##
+
+## Expected Behavior ##
+
+## Steps to Reproduce ##
+
+# Question #
+
+<!-- delete this section if it does not apply -->
+The title of the issue should start with `Question:` followed by a
+succinct title. Add the text of your question here. Be specific. Search for
+answers on [Google] and [Stack Overflow]
+before asking a new question
+
+# Request for Enhancement (RFE) #
+
+<!-- delete this section if it does not apply -->
+The title of the issue should start with `RFE:` followed by a succinct
+title.  If you are willing to help out, please review the [Contributing to GCC] 
+page.
+
+[links]:#
+[Google]: https://www.google.com
+[Stack Overflow]: https://stackoverflow.com
+[fenced codeblocks]: https://help.github.com/articles/creating-and-highlighting-code-blocks/
+[CONTRIBUTING.md]: https://github.com/sourceryinstitute/OpenCoarrays/blob/master/CONTRIBUTING.md
+[Helping Out]: https://github.com/sourceryinstitute/OpenCoarrays/blob/master/CONTRIBUTING.md#helping-out
+[Contributing to GCC]: https://gcc.gnu.org/contribute.html