Elaborate Documentation for #366: Signing and Verifying Docker Images with Notation and Harbor

[anshdeep0504]

This PR addresses issue #366 by providing a comprehensive, beginner-friendly guide to signing and verifying Docker images using Notation and Harbor. The documentation focuses on:

Clear Explanations for Beginners: Simplifies complex concepts like Docker images, Notation, Harbor, keys, certificates, and trust policies, making the topic accessible to new developers.
Step-by-Step Implementation: Includes detailed instructions for installing Harbor, setting up SSL, generating keys, signing images, and verifying signatures.
Security and Compliance Focus: Highlights the importance of signing Docker images for integrity, authenticity, and compliance in software supply chains.
Practical Examples: Covers real-world use cases such as building and pushing Docker images, generating trust policies, and enforcing strict signature verification.
This enhanced documentation serves as an in-depth resource, ensuring developers of all levels can securely manage container images using Notation and Harbor.

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[yizha1]

@anshdeep0504 Thanks for your contribution. Can you use markdown file as other documents, check out this folder https://github.com/notaryproject/notaryproject.dev/tree/main/content/en, your document should be like one of them in markdown format.

Another thing is that you need to sign your commit, you can take a look at this guide: https://github.com/notaryproject/.github/blob/main/CONTRIBUTING.md#commit

/cc @FeynmanZhou