docs: creating DEVELOPMENT.md and MAINTAINERS.md

[sivasathyaseeelan]

DEVELOPMENT.md: This document will serve as a guide for new contributors to understand the project, including setup instructions, development workflows, coding standards, testing and guidelines for submitting changes.

MAINTAINERS.md: This document will list the maintainers, their roles, and contact methods, enabling new contributors to easily reach out with doubts or clarifications about the project.

[TorkelE]

If DEVELOPMENT.md is something standard, we could have a link to here, but https://docs.sciml.ai/Catalyst/dev/devdocs/dev_guide/ (to be expanded) is where we generally plan to have development stuff.

GitHub kind of has a maintainers list at https://github.com/SciML/Catalyst.jl/graphs/contributors, and I think the https://github.com/SciML/Catalyst.jl?tab=readme-ov-file#getting-help-or-getting-involved section on the main landing page is probably where we would want to have info regarding how to contact people.