Update README.md and add Makefile for frontend setup

[LogicalGuy77]

Summary

This PR introduces aMakefile to the frontend directory to streamline the setup and development workflow for the Models Web Application frontend. Fixes #132

Features

Automated Setup:

• Clones the Kubeflow repository if not present.
• Checks out the correct commit for the shared kubeflow-common-lib based on the COMMIT file.
• Builds and links the common library only if needed (with smart caching based on commit hash).
• Installs frontend dependencies and links the common library.

Environment Variable Support:

Allows overriding the default Kubeflow repository location via the KUBEFLOW_REPOSITORY environment variable (defaults to ../../kubeflow).

Clean Command:

Provides a make clean target to remove node_modules.

[Griffin-Sullivan]

Works for me nice work!