chore: add repo essentials and GitHub templates

- Add MIT LICENSE file
- Add CONTRIBUTING.md with skill creation guide
- Add AGENTS.md and CLAUDE.md for AI agent guidelines
- Add issue template for skill requests
- Add PR templates for new skills, updates, and docs
- Update README with links to contributing guide and license

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Agent Skills Specification
+    url: https://agentskills.io/specification.md
+    about: Learn the skill format before creating or requesting a skill
+  - name: Contributing Guide
+    url: https://github.com/coreyhaines31/marketingskills/blob/main/CONTRIBUTING.md
+    about: How to contribute a new skill to this repository

.github/ISSUE_TEMPLATE/skill-request.yml

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+name: Skill Request
+description: Request a new marketing skill
+title: "Skill Request: [skill-name]"
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for suggesting a new skill! Please fill out the details below.
+
+  - type: input
+    id: skill-name
+    attributes:
+      label: Suggested skill name
+      description: Lowercase, hyphens only (e.g., "landing-page-audit")
+      placeholder: "my-skill-name"
+    validations:
+      required: true
+
+  - type: textarea
+    id: description
+    attributes:
+      label: What should this skill do?
+      description: Describe the skill's purpose and capabilities
+      placeholder: "This skill should help with..."
+    validations:
+      required: true
+
+  - type: textarea
+    id: triggers
+    attributes:
+      label: When should it be used?
+      description: What trigger phrases or scenarios should activate this skill?
+      placeholder: |
+        - When the user says "..."
+        - When working on...
+    validations:
+      required: true
+
+  - type: textarea
+    id: examples
+    attributes:
+      label: Example use cases
+      description: Provide 1-3 specific examples of how you'd use this skill
+      placeholder: |
+        1. I want to...
+        2. Help me...
+    validations:
+      required: false
+
+  - type: dropdown
+    id: category
+    attributes:
+      label: Category
+      description: Which category does this skill fit into?
+      options:
+        - CRO (Conversion Rate Optimization)
+        - Copywriting
+        - SEO
+        - Paid Ads
+        - Growth / Strategy
+        - Analytics
+        - Other
+    validations:
+      required: true
+
+  - type: textarea
+    id: related-skills
+    attributes:
+      label: Related existing skills
+      description: Are there existing skills this relates to or differs from?
+      placeholder: "Similar to page-cro but focused on..."
+    validations:
+      required: false

.github/PULL_REQUEST_TEMPLATE/documentation.md

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+## Documentation
+
+## Summary
+
+<!-- What documentation changes are you making? -->
+
+## Files changed
+
+<!-- List the files you're updating -->
+
+## Checklist
+
+- [ ] Links are valid
+- [ ] Formatting is consistent with existing docs
+- [ ] No sensitive data or credentials

.github/PULL_REQUEST_TEMPLATE/new-skill.md

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+## New Skill
+
+**Skill name:** `skills/SKILL-NAME`
+
+## Summary
+
+<!-- What does this skill do and when should it be used? -->
+
+## Checklist
+
+- [ ] `name` matches directory name exactly
+- [ ] `name` follows naming rules (lowercase, hyphens, no `--`)
+- [ ] `description` is 1-1024 chars with trigger phrases
+- [ ] `SKILL.md` is under 500 lines
+- [ ] No sensitive data or credentials
+- [ ] Tested locally with AI agent

.github/PULL_REQUEST_TEMPLATE/skill-update.md

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+## Skill Update
+
+**Skill:** `skills/SKILL-NAME`
+
+## Summary
+
+<!-- What changes are you making and why? -->
+
+## Type of update
+
+- [ ] Bug fix
+- [ ] Improved instructions
+- [ ] Added references/scripts
+- [ ] Other
+
+## Checklist
+
+- [ ] Changes are focused and minimal
+- [ ] `SKILL.md` is still under 500 lines
+- [ ] No sensitive data or credentials
+- [ ] Tested locally with AI agent