Document environment varables to setup project easily

since the project uses numerous environments, it is a good practice to document the configs that are required to run the project.

Start by inspecting the repository for environment-variable usage and the configuration required to run the project. Document the required variables and setup details in the project's documentation. The work is done when a new contributor can identify the needed configuration and set up the project without guessing.

Written by the indexing model from the issue text.