Add GitHub issue and PR templates

.github/ISSUE_TEMPLATE/BUG_REPORT.md

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+---
+name: "🐞 Bug report"
+about: Report a problem with this software
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**What version of this package are you using?**
+
+**What operating system, Node.js, and npm version?**
+
+**What happened?**
+
+**What did you expect to happen?**
+
+**Are you willing to submit a pull request to fix this bug?**

.github/ISSUE_TEMPLATE/FEATURE_REQUEST.md

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+---
+name: "⭐️ Feature request"
+about: Request a new feature to be added
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**What version of this package are you using?**
+
+**What problem do you want to solve?**
+
+**What do you think is the correct solution to this problem?**
+
+**Are you willing to submit a pull request to implement this change?**

.github/PULL_REQUEST_TEMPLATE.md

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+**What is the purpose of this pull request?**
+
+**What changes did you make? (brief overview)**
+
+**Is there anything you'd like reviewers to focus on?**