Create Dockerfile

[mbharanya]

Subject: Add Docker Support and Update README

This pull request introduces Docker support for axmldec to provide an easier and more consistent build and execution environment. It also includes updates to the documentation to reflect these changes.

Changes:

1. Added Dockerfile: A multi-stage Dockerfile has been added to the project root.
   • It uses a builder stage to compile the application, which keeps the final image small.
   • It includes all necessary dependencies (ca-certificates, boost libraries, zlib) to prevent common build and runtime errors.
2. Updated README.md: The README has been updated with a new section, "4.2 Building and Running with Docker".
   • This section provides clear, step-by-step instructions for building the Docker image and running axmldec within a container to process both AndroidManifest.xml and .apk files.

These changes make it significantly easier for users on any platform to use axmldec without having to manually install dependencies on their host system.