Add initial gitlab issue/MR templates.

This is in reference to mom-ocean#46, and is a first attempt at adding these templates.

.gitlab/issue_templates/Bug.md

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+<!--- Provide a general summary of the issue in the Title above -->
+
+## Expected Behavior
+<!--- Tell us what should happen -->
+
+## Current Behavior
+<!--- Tell us what happens instead of the expected behavior -->
+
+## Possible Solution
+<!--- Not obligatory, but suggest a fix/reason for the bug, -->
+
+## Steps to Reproduce
+<!--- Provide a link to a live example, or an unambiguous set of steps to -->
+<!--- reproduce this bug. Include code to reproduce, if relevant -->
+1.
+2.
+3.
+4.
+
+## Context (Environment)
+<!--- How has this issue affected you? What are you trying to accomplish? -->
+<!--- Providing context helps us come up with a solution that is most useful in the real world -->
+
+<!--- Provide a general summary of the issue in the Title above -->
+
+## Detailed Description
+<!--- Provide a detailed description of the change or addition you are proposing -->
+
+## Possible Implementation
+<!--- Not obligatory, but suggest an idea for implementing addition or change -->

.gitlab/merge_request_templates/Default.md

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+## Description
+<!-- Describe your changes in detail -->
+
+## Related Issue(s)
+<!--- If suggesting a new feature or change, please discuss it in an issue first -->
+<!--- If fixing a bug, there should be an issue describing it with steps to reproduce -->
+<!--- Please link to the issue here: -->
+
+## Motivation and Context
+<!--- Why is this change required? What problem does it solve? -->
+<!--- If it fixes an open issue, please link to the issue here. -->
+
+## How Has This Been Tested?
+<!--- Please describe in detail how you tested your changes. -->
+<!--- Include details of your testing environment, and the tests you ran to -->
+<!--- see how your change affects other areas of the code, etc. -->