github: add issue templates

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: bug report
+about: report an issue with downloads or something else
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**bug description**
+a clear and concise description of what the bug is.
+
+**reproduction steps**
+steps to reproduce the behavior:
+1. go to '...'
+2. click on '....'
+3. download this video: **[link here]**
+4. see error
+
+**screenshots**
+if applicable, add screenshots or screen recordings to help explain your problem.
+
+**links**
+if applicable, add links that cause the issue. more = better.
+
+**platform**
+- OS [e.g. iOS, windows]
+- browser [e.g. chrome, safari, firefox]
+- version [e.g. 115]
+
+**additional context**
+add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: feature request
+about: suggest a feature for cobalt
+title: ''
+labels: feature request
+assignees: ''
+
+---
+
+**describe the feature you'd like to see**
+a clear and concise description of what you want to happen.
+
+**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.