chore: add issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Create a report to help us improve
+body:
+  - type: textarea
+    id: describe-the-bug
+    attributes:
+      label: Describe the bug
+      description: A clear and concise description of what the bug is.
+    validations:
+      required: true
+
+  - type: textarea
+    id: to-reproduce
+    attributes:
+      label: To Reproduce
+      description: Describe how to reproduce the issue in a consuming application or a standalone example. Include the affected function, type, or schema if known, and a minimal code example if available.
+      value: |
+        1. Use wallet-common in '...' (consuming repository or standalone example).
+        2. Set up the relevant configuration and input '...'.
+        3. Perform the action or run the code that triggers the issue '...'.
+        4. Observe the error or incorrect result '...'.
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected-behavior
+    attributes:
+      label: Expected behavior
+      description: A clear and concise description of what you expected to happen.
+    validations:
+      required: true
+
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots
+      description: If applicable, add screenshots to help explain your problem.
+
+  - type: textarea
+    id: environment-information
+    attributes:
+      label: Environment information (if available)
+      description: Please complete the lines that apply.
+      value: |
+        - wallet-common version, tag, or commit:
+        - Consuming application and version:
+        - Runtime: [Node.js / browser]
+        - Node version (if applicable):
+        - TypeScript version (if applicable):
+        - OS:
+        - Browser and version (if applicable):
+        - Credential format or protocol (if applicable):
+
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      description: Add any other context about the problem here.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Discussions
+    url: https://github.com/orgs/wwWallet/discussions
+    about: Propose new ideas, provide feedback or ask for help

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest a new feature for this project
+body:
+  - type: textarea
+    id: problem-statement
+    attributes:
+      label: Problem Statement
+      description: 'A clear and concise description of the problem or need you want this feature to address.'
+    validations:
+      required: true
+
+  - type: textarea
+    id: proposed-solution
+    attributes:
+      label: Proposed Solution
+      description: 'The solution you propose to address the problem.'
+      placeholder: |
+        Describe your suggested solution in detail. Be sure to include:
+        * The technical implementation and any key considerations.
+        * Tradeoffs or challenges in your proposed approach.
+        * Future implications or caveats to be aware of.
+
+        If you have multiple ideas for solutions, present each one clearly. Comparisons can be included at the end.
+
+  - type: textarea
+    id: additional-information
+    attributes:
+      label: Additional Information
+      description: 'Any other relevant details, such as context, screenshots, external references, or links to related issues or discussions.'
+
+  - type: markdown
+    attributes:
+      value: |
+        ### 📢 Before You Submit:
+        Please check our [Discussions](https://github.com/orgs/wwWallet/discussions) to see if this feature has already been requested or is being discussed. Joining an ongoing conversation can help refine ideas and avoid duplication.