Added devcontainer for quick setup in vscode

[akshatd]

Purpose

Add a devcontainer to the repo so that it is easier for users to set this up in a single click

Expected time until merged

Not urgent, can be merged whenever the maintainers feel the need for it

Type of change

This is more of a devops change, gonna mark it as Maintenance

• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (non-backwards-compatible fix or feature)
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no API changes)
• [ ] Documentation update
• [x] Maintenance update
• [ ] Other (please describe)

Testing

• Install (all steps are here)
  • vscode
  • docker
  • devcontainer extension
• Open the repository in vscode
• click open in devcontainer
• go through the tutorial

Checklist

• [x] I have run flake8 and black to make sure the Python code adheres to PEP-8 and is consistently formatted
• [x] I have formatted the Fortran code with fprettify or C/C++ code with clang-format as applicable
• [x] I have run unit and regression tests which pass locally with my changes
• [x] I have added new tests that prove my fix is effective or that my feature works
• [x] I have added necessary documentation