Initial issue templates

Starting with just a bug report & feature request.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is. Include the version(s) of DSpace where you've seen this problem & what web browser you were using. Link to examples if they are public.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Do this
+2. Then this...
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Related work**
+Link to any related tickets or PRs here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a new feature for this project
+title: ''
+labels: new feature
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives or workarounds you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.