docs(outline): added points / remarks

focusing on understanding the project and the tech behind the poc

user_documentation.md

@@ -2,9 +2,21 @@
 
 ## 📋 Outline
 - [What is it? (short description what the software does, max 3 sentences)](#what-is-it)
+  - A couple of use cases (different scopes)
+  - Why do I need / want this? When should I pass?
+  - Compare with other platforms
+  - Compare with well-known tools (what parts of my stack / pipeline does this cover?)
+    - argo -> vercel
+    - monitoring -> data dog
+    - forgejo -> graphite
 - [Main features (brief list of main features and enablers - why it is in the stack)](#main-features)
+  - what are our opinions / core principles and believes that are backed in?
+    - k8s > *
 - [Quick start guide](#quick-start-guide)
 - [Configuration](#configuration)
+  - structure of the poc (where / how can I change something?)
+  - how does it work? (bootstrapping++)
+- [Known Issues / TODOs](#known-issues)
 - [References (documentation links etc...)](#references)
 
 ## 🧐 What is it?