✨ Add Copilot instructions for ICESEE repository

[Copilot]

Overview

This PR implements GitHub Copilot instructions for the ICESEE repository as requested in issue #[issue_number]. The instructions will help Copilot provide more contextually relevant code suggestions and better assist developers working on this project.

Changes

Created .github/copilot-instructions.md with comprehensive guidance including:

Project Context

• Overview: ICESEE is a data assimilation framework for ice sheet models (ISSM, Icepack, Lorenz-96)
• Technology Stack: Python 3.6+, NumPy, SciPy, MPI4py, Firedrake, H5py, Zarr
• Purpose: Ensemble-based data assimilation using Ensemble Kalman Filter (EnKF) variants

Developer Guidance

• Project Structure: Directory organization showing src/, applications/, config/ layout
• Coding Standards: Python naming conventions, documentation patterns (file headers with author/date/description)
• Key Concepts: Data assimilation terminology, ensemble management, forecast/analysis steps
• Common Tasks: Adding new models, working with parallelization (MPI/Dask/Ray), data storage patterns

Technical Details

• EnKF implementation patterns (Stochastic vs Deterministic variants)
• YAML configuration parameter usage
• HDF5/Zarr data storage conventions
• Parallelization best practices (MPI context awareness, thread management)
• External model integration specifics for Icepack, ISSM, and Lorenz-96

Benefits

With these instructions, GitHub Copilot will:

• Understand the scientific computing context and data assimilation concepts
• Follow established code organization and naming patterns
• Suggest appropriate parallelization approaches
• Generate code consistent with the project's file header and documentation style
• Better assist with model integration tasks

References

Follows best practices documented at https://gh.io/copilot-coding-agent-tips

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 -s REDACTED (dns block)
• gh.io
  • Triggering command: curl -s REDACTED (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 #22

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💡 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.