feat: add pr and issue templates

.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: ""
+---
+
+**What steps did you take and what happened:**
+[A clear and concise description of what the bug is.]
+
+**What did you expect to happen:**
+
+**Anything else you would like to add:**
+[Miscellaneous information that will assist in solving the issue.]
+
+**Environment:**
+
+- Attest version:

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ""
+labels: enhancement
+assignees: ""
+---
+
+**Describe the solution you'd like**
+[A clear and concise description of what you want to happen.]
+
+**Anything else you would like to add:**
+[Miscellaneous information that will assist in solving the issue.]

.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+
+<!-- Description of why the pull request is needed and what it changes -->
+
+### Tests
+
+<!-- Provide evidence of testing -->
+
+### Issue
+
+<!-- Link to issue that this is part of -->