made changes in files

[amreshanand]

I updated README.md. Summary of changes (concise):

Added "Contents summary" — outlines typical repo directories and purpose. Added "Getting started (clone)" — HTTPS and SSH git clone commands. Added "Raise a Pull Request (typical workflow)" — step-by-step branch, commit, push, PR guidance and PR description checklist. Added "Local preview and testing" — instructions to check CONTRIBUTING.md and example commands for running a local preview. Expanded "Contributing & support" — brief contribution guidelines. Added "Useful links" — links to repo, live docs, issues, templates, discussions, and local paths. Added "Development details (local setup)" — example local setup for Hugo, MkDocs, and Docker. Added "Branch & commit conventions" — branch naming and commit message guidance (Conventional Commits example). Added "CI, linters & checks" — note about CI pipelines and pre-PR checks. Added "Reporting security issues" — guidance to avoid public issues and reference to GitHub security advisories. Added "License" — pointer to the LICENSE file.