add proof json and flow

assets/proof_of_observability_flow.md

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+# Proof-of-Observability Flow
+
+This document describes the core flow of how Obsero transforms raw service observations into decentralized, verifiable monitoring proofs.
+
+Each observation follows this lifecycle:
+
+```mermaid
+flowchart TD
+    A[Observer Probe] --> B[Ping Target]
+    B --> C[Generate JSON Observation]
+    C --> D[Hash + Sign Observation]
+    D --> E[Upload JSON to IPFS]
+    E --> F[Submit Hash + CID to Smart Contract]
+    F --> G[Proof is Publicly Verifiable (on-chain + IPFS)]