Add custom agent template in .github

[Copilot]

The issue requested a basic custom agent definition file in patrickcarmichael/.github using the provided frontmatter format, ready to be merged to make the agent available. This PR adds a minimal, reusable template that matches that format.

• Custom agent template
  • Added .github/agents/agent-template.md with required frontmatter and clear placeholders for name, description, overview, and example prompts.

Example template:

---
name: [Agent Name]
description: [Brief description of your agent's purpose, capabilities, and use cases.]
---

# [Agent Name]

Original prompt

Create an issue in patrickcarmichael/.github to create a custom agent:

---

Fill in the fields below to create a basic custom agent for your repository.

The Copilot CLI can be used for local testing: https://gh.io/customagents/cli

To make this agent available, merge this file into the default repository branch.

For format details, see: https://gh.io/customagents/config

name:
description:

My Agent

Describe what your agent does here...

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

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