Add c4 CSM v2 report

Author: grstepanov

README.md

@@ -669,6 +669,13 @@ See [full report](Composable%20Security%20Lido%20Oracle%20V5_2%2006-25.pdf) for
 
 See [full report](zk/Nethermind_LIDO_ACCOUNTING_ZK_ORACLE_FINAL.pdf) for more details.
 
+### 08-2025 Code4rena Audit of Lido Community Staking Module
+
+- Total Issues: 2 (2 Acknowledged)
+- Low Issues: 2 (2 Acknowledged)
+
+See [full report](Code4rena%20CSM%20V2%20Audit%20Report%2008-2025.pdf) for more details.
+
 ## Lido Multichain audit reports
 
 ### 07-2022 Oxorio Lido L2 Smart Contracts Security Audit Report