SDLC Update: Building Docker Compose file along with a doc for airgap-wallet

[TauqeerAhmad5201]

We already have a Dockerfile for running up the project. Adding Docker Compose simplifies the process of defining and sharing multi-container applications. It allows you to configure services, networks, and volumes using a single, human-readable YAML file.

[TauqeerAhmad5201]

Allow me to work on this process. I would be contributing according to the requirements of the project.