chore: add issue and pr templates (#41)

* Add pull request template

* Add CC link and issue linking example

* Add issue templates

.github/ISSUE_TEMPLATE/bug.yml

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+name: Bug report
+description: File a bug report
+title: '[BUG] '
+labels: ['bug', 'triage']
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: Steps to reproduce
+      description: Explain how the behavior can be reproduced.
+      value: |
+        1. Go to '...'
+        2. Click on '....'
+        3. Scroll down to '....'
+        4. Click on '...'
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected result
+      description: A clear and concise description of what you expected to happen.
+    validations:
+      required: true
+
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual result
+      description: A clear and concise description of what is happening.
+    validations:
+      required: true
+
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots or videos
+      description: If applicable, add screenshots and/or a short video to help explain your problem.
+
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      description: Add any other context about the problem here.
+
+  - type: dropdown
+    id: os
+    attributes:
+      label: Operating system
+      description: What operating system are you seeing the problem on?
+      multiple: true
+      options:
+        - Windows
+        - macOS
+        - Linux
+        - Android
+        - iOS
+    validations:
+      required: true
+
+  - type: input
+    id: os-version
+    attributes:
+      label: Operating system version
+      description: What version of the operating system(s) are you seeing the problem on?
+
+  - type: dropdown
+    id: browsers
+    attributes:
+      label: Browsers
+      description: What browser(s) are you seeing the problem on?
+      multiple: true
+      options:
+        - Chrome
+        - Microsoft Edge
+        - Firefox
+        - Opera
+    validations:
+      required: true
+
+  - type: input
+    id: browser-version
+    attributes:
+      label: Browser version
+      description: What version of the browser(s) are you seeing the problem on?
+
+  - type: input
+    id: version
+    attributes:
+      label: Extension version
+      description: What version of our extension are you running?
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Ask a question
+    url: https://github.com/interledger/web-monetization-extension/discussions
+    about: Ask questions and discuss with other community members

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: Feature request
+description: Submit a feature request
+title: '[FEATURE REQUEST] '
+labels: ['discussion: idea', 'triage']
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this feature request! Please fill out this form as completely as possible. If this issue has a `needs approval` label, please do not start coding yet. Wait until a core member approves the feature request by removing this label.
+
+  - type: textarea
+    id: describe
+    attributes:
+      label: Describe the feature you would like to request
+      description: A clear and concise description of what you want and what your use case is.
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Describe the solution you would like
+      description: A clear and concise description of what you want to happen.
+    validations:
+      required: true
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/feature.yml

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+name: Feature
+description: Scope out a feature implementation
+body:
+  - type: textarea
+    id: context
+    attributes:
+      label: Context
+      description: A clear and concise description of the feature.
+    validations:
+      required: true
+
+  - type: textarea
+    id: todos
+    attributes:
+      label: Todos
+      description: List of todos to complete the feature.
+    validations:
+      required: true

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Pull request titles should follow conventional commit format.
+https://www.conventionalcommits.org/en/v1.0.0/
+-->
+
+## Context
+
+<!--
+What were you trying to do?
+Provide further details about how the feature should be tested/reviewed if necessary.
+If the PR is related to an open issue(s) please provide a list of them.
+
+Example:
+    - closes (or fixes) #<issue number>
+    - closes (or fixes) #<issue number>
+-->
+
+Closes #<issue number>.
+
+## Changes proposed in this pull request
+
+<!--
+Provide a succinct description of what this pull request entails.
+-->