chore: add community health files (Code of Conduct, issue templates)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug or unexpected behavior
+title: ''
+labels: bug
+assignees: ''
+---
+
+## What happened
+<!-- A clear description of the bug. -->
+
+## Steps to reproduce
+<!-- Minimal steps, command, or code sample. -->
+
+## Expected behavior
+
+## Version & environment
+<!-- Release/commit, language runtime version, OS. -->
+
+## Additional context

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Security vulnerability
+    url: https://github.com/Delego-Dev/specification/blob/main/SECURITY.md
+    about: Please report security issues privately per our security policy, not as a public issue.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea or improvement
+title: ''
+labels: enhancement
+assignees: ''
+---
+
+## Problem
+<!-- What are you trying to do, and what's missing or hard today? -->
+
+## Proposed solution
+
+## Alternatives considered
+
+## Additional context