Add a new Go client implementation for interacting with the IPAGo server. The client includes functionality for authentication, searching for apps, and downloading apps. The client is structured to handle errors and retries, and includes progress reporting for downloads. The client is added to the .gitignore file and the README.md file is updated with installation instructions. The server-side code is also updated to include the Content-Length header for download progress reporting.
Add docker configuration for building and running the application, including a dockerfile and docker-compose.yml. Set up go modules with dependencies and create the basic api structure with main.go, models, and wrapper files. Include .dockerignore and .gitignore files to manage ignored files and directories. Add constants for ipatool path and global flags.
