Update index.md - add codehawks/cyfrin

Author: Eversmile12

src/content/developers/docs/smart-contracts/security/index.md

@@ -489,6 +489,7 @@ If you plan on querying an on-chain oracle for asset prices, consider using one
 - **[CertiK](https://www.certik.com/)** - _Blockchain security firm pioneering the use of cutting-edge formal Verification technology on smart contracts and blockchain networks._
 
 - **[Trail of Bits](https://www.trailofbits.com/)** - _Cybersecurity company that combines security research with an attacker mentality to reduce risk and fortify code._
+- **[Cyfrin](https://www.cyfrin.io/)** - _Blockchain Security and web3 education firm focused on EVM and Vyper based protocols_
 
 - **[PeckShield](https://peckshield.com/)** - _Blockchain security company offering products and services for the security, privacy, and usability of the entire blockchain ecosystem._
 
@@ -505,6 +506,8 @@ If you plan on querying an on-chain oracle for asset prices, consider using one
 - **[HashEx](https://hashex.org/)** - _HashEx focuses on blockchain and smart contract auditing to ensure the security of cryptocurrencies, providing services such as smart contract development, penetration testing, blockchain consulting._
 
 - **[Code4rena](https://code4rena.com/)** - _Competitive audit platform that incentivizes smart contract security experts to find vulnerabilities and help make web3 more secure._
+- **[CodeHawks](https://codehawks.com/)** - _Competitive audits platform hosting smart contracts auditing competitions for security researchers.
+
 
 ### Bug bounty platforms {#bug-bounty-platforms}