meta: add issue templates

Signed-off-by: Mingde (Matthew) Zeng <matthewzmd@gmail.com>

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: EAF Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Ensure you're on the latest master branch, then note the steps to reproduce the behavior.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Versions (please complete the following info):**
+ - Distro and DE/WM:
+ - Versions of Dependencies:
+ - M-x emacs-version:
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: EAF Feature request
+about: Suggest an idea for the Emacs Application Framework
+title: ''
+labels: ''
+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 you've considered**
+A clear and concise description of an alternative solutions or features you've considered, if any.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.