Basic operational manual (#286)

* Adding claim model and adding a operational-manual.md

* Adding different ways of troubleshooting the operator

* Adding examples to operational-manual.md

* Adding new diagram for representing the claim model

* Updating SVG to match light backgrounds

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Co-authored-by: Pablo Garcia Miranda <pablo.garciamiranda@swisscom.com>

Author: pablogarciamiranda

README.md

@@ -4,6 +4,14 @@
 
 NetBox Operator extends the Kubernetes API by allowing users to manage NetBox resources – such as IP addresses and prefixes – directly through Kubernetes. This integration brings Kubernetes-native features like reconciliation, ensuring that network configurations are maintained automatically, thereby improving both efficiency and reliability.
 
+## The Claim Model
+The NetBox Operator implements a "Claim Model" which is also used in the Kubernetes PersistentVolumeClaims (PVCs).
+In this case, instead of disk storage, NetBox Operator dynamically allocates network resources (Prefixes and IP Addresses) based on claims submitted via custom resources.
+
+### Purpose
+This model ensures a declarative management of IP addressing and subnet allocation, with full NetBox integration.
+The users will create claims (PrefixClaims & IPAddressClaims), and the NetBox Operator will resolve them into actual Prefixes and IPAddresses within a designated parent prefix.
+
 ![Figure 1: NetBox Operator High-Level Architecture](docs/netbox-operator-high-level-architecture.drawio.svg)
 
 # Getting Started