docs: Update ADR-001 to clarify webhook-triggered auto-apply process

docs/decisions/001-webhook-auto-apply.md

@@ -1,5 +1,14 @@
+
 # ADR-001: Webhook-Triggered Auto-Apply on Merge to Main
 
+## In Plain Language
+
+This document explains a new way to make our automation system easier and faster. Right now, after someone reviews and merges a pull request (PR) in GitHub, a person has to go into AWS Service Catalog and start the next step by hand. This is slow and can lead to mistakes or delays.
+
+We want to change this so that when a PR is merged to the main branch, our system will automatically start the next step without anyone having to do it manually. We will do this by using a GitHub webhook, which is a tool that tells our system when something important happens in the repo. When the webhook sees a new change on main, it will trigger our automation to run the apply step right away.
+
+This paper describes how this automatic process will work, what files and settings are needed, and what changes we have to make to our system. The goal is to make things smoother, faster, and less error-prone for everyone who uses our platform.
+
 **Status:** Proposed  
 **Date:** 2026-05-11  
 **Branch:** feature/template-repo-rendering