docs: contributing.md (#3248)

Co-authored-by: Jay <air@live.ca>

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: Bug report
+description: Report an issue that should be fixed
+labels: ["bug"]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Describe the bug you encountered
+      placeholder: What happened?
+    validations:
+      required: true
+
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: Steps to reproduce
+      description: How can we reproduce this issue?
+      placeholder: |
+        1.
+        2.
+        3.
+    validations:
+      required: false
+
+  - type: textarea
+    id: screenshot-or-link
+    attributes:
+      label: Screenshot and/or share link
+      description: Run `/share` to get a share link, or attach a screenshot
+      placeholder: Paste link or drag and drop screenshot here
+    validations:
+      required: false
+
+  - type: input
+    id: os
+    attributes:
+      label: Operating System
+      description: what OS are you using?
+      placeholder: e.g., macOS 26.0.1, Ubuntu 22.04, Windows 11
+    validations:
+      required: false
+
+  - type: input
+    id: terminal
+    attributes:
+      label: Terminal
+      description: what terminal are you using?
+      placeholder: e.g., iTerm2, Ghostty, Alacritty, Windows Terminal
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: 💬 Discord Community
+    url: https://discord.gg/opencode
+    about: For quick questions or real-time discussion. Note that issues are searchable and help others with the same question.

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: 🚀 Feature Request
+description: Suggest an idea, feature, or enhancement
+labels: [discussion]
+title: "[FEATURE]:"
+
+body:
+  - type: checkboxes
+    id: verified
+    attributes:
+      label: Feature hasn't been suggested before.
+      options:
+        - label: I have verified this feature I'm about to request hasn't been suggested before.
+          required: true
+
+  - type: textarea
+    attributes:
+      label: Describe the enhancement you want to request
+      description: What do you want to change or add? What are the benefits of implementing this? Try to be detailed so we can understand your request better :)
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/question.yml

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+name: Question
+description: Ask a question
+labels: ["question"]
+body:
+  - type: textarea
+    id: question
+    attributes:
+      label: Question
+      description: What's your question?
+    validations:
+      required: true