Add GitHub issue templates.

Author: stuconnolly

.github/bug_report.md

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+<!-- Please search existing issues to avoid creating duplicates. -->
+<!-- For application crashes on macOS 10.14 (Mojave) please see issue #3116. -->
+
+- macOS Version:
+- Sequel Pro Version:
+
+**Description**
+A clear and concise description of what the bug is.
+
+**Steps To Reproduce**
+1.
+2.
+
+**Expected Behaviour**
+A clear and concise description of what you expected to happen.
+
+**Additional Context**
+Add any other context about the problem here.
+
+<!-- Please include any screenshots and crash logs that might help investigating and addressing the issue. -->

.github/feature_request.md

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+<!-- Please search existing issues to avoid creating duplicates. -->
+
+<!-- Describe the feature you'd like. -->