Release 0.1.0

Added

• 2D geometric feature package into the geometry/ directory
• Vectorized high-performance panel methods into the solver/ directory
• tests/ folder containing [pytest] unit-tests
• Initial assignment report added to the docs/ directory
• Assignment I task scripts to the assignment/ directory
• UML activity and class diagram to the assignment/ directory
• GitHub Actions to automate deployment as well as code-coverage metrics
• Template to permit use of the src/ Python package layout
• setup.py and setup.cfg file for setting project metadata, dependencies,
  code formatting, testing, and linting/style options
• .gitignore file to specify untracked files
• .editorconfig file to enforce line endings and file encodings/whitespace
• pyproject.toml file for setting [black] character limit
• Ability to install gammapy installable through [pip]
• Apache 2.0 license header and license file
• Sample test_airfoil unit-test to trigger coverage.py to run
• README.md to instruct users how to install gammapy
• CONTRIBUTING.md file to welcome new developers to the project
• CHANGELOG.md to log the Semantic Versioning of the project

Changed

• Location of Python files into the new src/gammapy/ directory
• Location of old panel methods and moved them into src/gammapy/legacy/

Removed

• Sample test test_numpy.py