[Docs]: Docs for CRs schema and supported intent IDs

[anurag-rajawat]

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Description

This issue aims to document the schemas and supported intent IDs for custom resources (CRs) used to manage security policies in Nimbus.

We need documentation for:

Cluster scoped CRs:

• [ ] SecurityIntent CR schema
• [ ] ClusterSecurityIntentBinding CR schema
• [ ] ClusterNimbusPolicy CR schema

Namespace scoped CRs:

• [ ] SecurityIntentBinding CR schema
• [ ] NimbusPolicy CR schema

Supported Intent IDs:

• [ ] Create a table or list of supported IDs with their descriptions and use cases. Reference: https://github.com/5GSEC/nimbus/blob/main/pkg/adapter/idpool/idpool.go

Nimubs

• [ ] Update Nimbus architecture diagram in the readme file to reflect the current architecture.
• [ ] Add contribution and development guide.