Add Security Best Practices Section to Linea Docs

docs/get-started/security.md

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+# Security Best Practices for Linea Developers
+
+Security is a critical aspect of smart contract development on Linea. Below are best practices to help developers build secure applications.
+
+## 1. Use Proper Access Controls
+- Implement role-based permissions using `Ownable` or `AccessControl`.
+- Restrict critical functions to specific accounts or contract logic.
+
+## 2. Avoid Reentrancy Attacks
+- Use the **Checks-Effects-Interactions** pattern.
+- Utilize Reentrancy Guards (`nonReentrant` modifier in OpenZeppelin).
+
+## 3. Prevent Integer Overflows and Underflows
+- Use `SafeMath` or Solidity 0.8+ built-in overflow protection.
+
+## 4. Secure Private Keys and Environment Variables
+- Store secrets in `.env` files and **never hardcode private keys**.
+- Use secure wallet infrastructure like **hardware wallets** for deployments.
+
+## 5. Be Cautious with External Calls
+- Validate and sanitize all user input.
+- Avoid making state-changing calls to unknown contracts.
+
+## 6. Regularly Audit and Test Your Smart Contracts
+- Write comprehensive unit tests and use **fuzzing techniques**.
+- Consider third-party **smart contract audits** before deployment.
+
+For additional resources, visit [Ethereum Security Best Practices](https://ethereum.org/en/developers/docs/smart-contracts/security/).