docs: add issue/PR templates and contributing guide (#63)

* docs: add issue/PR templates and contributing guide
- Add GitHub Issue forms: bug report, feature request, new site adapter
- Add PR template with CI-aligned checklist (typecheck, test, validate)
- Add CONTRIBUTING.md with adapter development workflow and testing guide

* docs: simplify adapter request and fix contributor example

* docs: trim contribution and issue templates

---------

Co-authored-by: jackwener <jakevingoo@gmail.com>

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,83 @@
+name: "🐛 Bug Report"
+description: Report a bug or unexpected behavior in OpenCLI
+title: "[Bug]: "
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to report a bug. A short reproduction and any error output are usually enough.
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: A clear and concise description of the bug.
+      placeholder: What happened?
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to Reproduce
+      description: How can we reproduce this behavior?
+      value: |
+        1. Run `opencli ...`
+        2. ...
+        3. See error
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+      description: What did you expect to happen?
+    validations:
+      required: true
+
+  - type: input
+    id: version
+    attributes:
+      label: OpenCLI Version
+      description: "Run `opencli --version` to find out."
+      placeholder: "0.8.0"
+    validations:
+      required: true
+
+  - type: dropdown
+    id: node-version
+    attributes:
+      label: Node.js Version
+      options:
+        - "20.x"
+        - "22.x"
+        - Other
+    validations:
+      required: true
+
+  - type: dropdown
+    id: os
+    attributes:
+      label: Operating System
+      options:
+        - macOS
+        - Linux
+        - Windows
+        - Other
+    validations:
+      required: true
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs / Screenshots
+      description: |
+        Paste any relevant error output. Run with `-v` for verbose logs:
+        ```
+        opencli <command> -v
+        ```
+      render: shell
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: 📖 Documentation
+    url: https://github.com/jackwener/opencli#readme
+    about: Check the README and docs before opening an issue.
+  - name: 🧪 Testing Guide
+    url: https://github.com/jackwener/opencli/blob/main/TESTING.md
+    about: How to run and write tests for OpenCLI.

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,42 @@
+name: "✨ Feature Request"
+description: Suggest a new feature or improvement
+title: "[Feature]: "
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Have an idea to make OpenCLI better? We'd love to hear it!
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Feature Description
+      description: A clear and concise description of the feature you'd like.
+    validations:
+      required: true
+
+  - type: textarea
+    id: use-case
+    attributes:
+      label: Use Case
+      description: What problem does this solve? Who benefits from this feature?
+      placeholder: "As a user, I want to ... so that ..."
+    validations:
+      required: true
+
+  - type: textarea
+    id: proposed-solution
+    attributes:
+      label: Proposed Solution
+      description: If you have a specific implementation in mind, describe it here.
+    validations:
+      required: false
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: Any alternative approaches you've thought about?
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/new_site_adapter.yml

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+name: "🌐 New Site Adapter Request"
+description: Request support for a new website
+title: "[Site]: "
+labels: ["new-adapter"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Want OpenCLI to support a new site? Tell us about it!
+
+  - type: input
+    id: site-name
+    attributes:
+      label: Site Name
+      description: The name of the website.
+      placeholder: "e.g. Product Hunt"
+    validations:
+      required: true
+
+  - type: input
+    id: site-url
+    attributes:
+      label: Site URL
+      description: The main URL of the website.
+      placeholder: "https://www.producthunt.com"
+    validations:
+      required: true
+
+  - type: textarea
+    id: commands
+    attributes:
+      label: Desired Commands
+      description: What commands would you like? List them with a brief description.
+      value: |
+        - `hot` — trending / popular items
+        - `search` — search the site
+    validations:
+      required: true
+
+  - type: textarea
+    id: api-examples
+    attributes:
+      label: Example Links or API Endpoints
+      description: Share any example page URLs or API endpoints if you have them (optional).
+      placeholder: |
+        Example page: https://www.producthunt.com/posts/example
+        GET https://api.producthunt.com/v2/posts?order=votes
+        Response: { "posts": [{ "name": "...", "tagline": "..." }] }
+    validations:
+      required: false
+
+  - type: checkboxes
+    id: contribution
+    attributes:
+      label: Willing to Contribute?
+      options:
+        - label: I'm willing to submit a PR for this adapter

.github/pull_request_template.md

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+## Description
+
+<!-- Briefly describe your changes and link to any related issues. -->
+
+Related issue:
+
+## Type of Change
+
+- [ ] 🐛 Bug fix
+- [ ] ✨ New feature
+- [ ] 🌐 New site adapter
+- [ ] 📝 Documentation
+- [ ] ♻️ Refactor
+- [ ] 🔧 CI / build / tooling
+
+## Checklist
+
+- [ ] I ran the checks relevant to this PR
+- [ ] I updated tests or docs if needed
+- [ ] I included output or screenshots when useful
+
+## Screenshots / Output
+
+<!-- If applicable, paste CLI output or screenshots here. -->