docs: add templates (#2)

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report 🐛
+description: Something not working as expected? This is the place to report your issue.
+labels:
+  - 'bug'
+body:
+  - type: markdown
+    attributes:
+      value: |
+        # Hi there! :wave:
+
+        Thanks for taking the time to fill out this bug report.
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: "Tell us more about the problem that you're running into."
+      placeholder: What did you see? What did you expect to see?
+    validations:
+      required: true
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: Steps to reproduce
+      description: 'How do we reproduce the error you described above?'
+      placeholder: |
+        1. Go to '...'
+        2. Click on '....'
+        3. Scroll down to '....'
+        4. See error
+    validations:
+      required: true
+  - type: input
+    id: version
+    attributes:
+      label: Version
+      description: 'What version of `@primer/live-region-element` are you using?'
+      placeholder: v1.0.0
+    validations:
+      required: true
+  - type: dropdown
+    id: browser
+    attributes:
+      label: Browser
+      description: In which browser(s) are you experiencing the issue?
+      multiple: true
+      options:
+        - Chrome
+        - Safari
+        - Firefox
+        - Edge
+        - iOS Safari
+  - type: dropdown
+    id: screen-reader
+    attributes:
+      label: Screen reader
+      description: In which screen reader(s) are you experiencing the issue?
+      multiple: true
+      options:
+        - JAWS
+        - NVDA
+        - VoiceOver on macOS
+        - VoiceOver on iOS
+        - Narrator
+        - Other

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true

.github/PULL_REQUEST_TEMPLATE.md

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+Closes #
+
+<!-- Short description of the PR. What does it do? -->
+
+#### Changelog
+
+**New**
+
+<!-- List of things added in this PR -->
+
+**Changed**
+
+<!-- List of things changed in this PR -->
+
+**Removed**
+
+<!-- List of things removed in this PR -->
+
+#### Testing & Reviewing
+
+<!-- Add descriptions, steps or a checklist for how reviewers can verify this PR works or not -->