Update README with sponsorship and user guide

Added sponsorship information and user guide section.

Author: amitsaha

README.md

@@ -3,6 +3,15 @@
 Code Quality [![Go Report Card](https://goreportcard.com/badge/github.com/amitsaha/gitbackup)](https://goreportcard.com/report/github.com/amitsaha/gitbackup)
 [![.github/workflows/ci.yml](https://github.com/amitsaha/gitbackup/actions/workflows/ci.yml/badge.svg)](https://github.com/amitsaha/gitbackup/actions/workflows/ci.yml)
 
+
+# Sponsorship
+
+As of February 2026, `gitbackup` development is supported by [Common Loop Works Pty Ltd](https://abr.business.gov.au/ABN/View?id=49688912389), a software development, 
+machine learning and cloud advisory company, founded by [Amit Saha](https://au.linkedin.com/in/echorand). Contact us for any custom on-prem or cloud deployment, new feature 
+requests or expedite any bug fixes.
+
+# User guide
+
 - [gitbackup - Backup your GitHub, GitLab, Bitbucket, and Forgejo repositories](#gitbackup---backup-your-github-gitlab-and-bitbucket-repositories)
   - [Introduction](#introduction)
   - [Installing `gitbackup`](#installing-gitbackup)