Add Copilot instructions for repository

[Copilot]

Configures GitHub Copilot instructions per best practices to improve context-aware assistance in this repository.

Changes

• Added .github/copilot-instructions.md with:
  • Project structure and Kotlin/Maven stack details
  • Coding standards (idiomatic Kotlin, naming conventions, null-safety)
  • Build commands and testing patterns
  • API design patterns showing the builder-like DSL:

    Server().apply {
        get("/path") { req, res -> res.send("response") }
        before("/path") { req, res -> /* filter */ }
        exception(ExceptionClass::class) { req, res -> "error" }
    }.start()

  • Dependency management and release process
  • CI/CD workflow requirements

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• docs.github.com
  • Triggering command: curl -L REDACTED (dns block)
• kotlinlang.org
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java -classpath /home/REDACTED/work/kottpd/kottpd/.mvn/wrapper/maven-wrapper.jar -Dmaven.home=/home/REDACTED/work/kottpd -Dmaven.multiModuleProjectDirectory=/home/REDACTED/work/kottpd/kottpd org.apache.maven.wrapper.MavenWrapperMain clean package --no-transfer-progress (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>✨ Set up Copilot instructions</issue_title>
<issue_description>Configure instructions for this repository as documented in Best practices for Copilot coding agent in your repository.

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes ✨ Set up Copilot instructions #94

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[Copilot]

Pull Request Overview

This PR adds a comprehensive Copilot instructions document to guide AI-assisted development for the kottpd REST framework project. The document serves as a reference for understanding the project structure, coding standards, and development workflows.

• Establishes project guidelines including technology stack (Kotlin 1.9.23, Java 11, Maven)
• Documents coding standards, API design patterns, and testing conventions
• Provides build commands, release process information, and CI/CD workflow details