chore: add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help improve omm
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Setup**
+Please complete the following information along with version numbers, if applicable.
+ - `omm` version (run `omm -v`) or git commit that you've built `omm` on
+ - OS [e.g. Ubuntu, macOS]
+ - Shell [e.g. zsh, fish]
+ - Terminal Emulator [e.g. kitty, iterm]
+ - Terminal Multiplexer [e.g. tmux]
+ - Locale [e.g. en_US.UTF-8, zh_CN.UTF-8, etc.]
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. ...
+2. ...
+3. Error occurs
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+Add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for omm
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**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 alternatives 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.