Update README.md

Author: nican0r

README.md

@@ -31,5 +31,20 @@ Provides utilities for invariant testing
 ## [Panic](https://github.com/Recon-Fuzz/setup-helpers/blob/main/src/Panic.sol)
 A library that provides named variables corresponding to compiler panic messages. Used to more easily access these messages when using the `checkError` utility.
 
+```solidity
+library Panic {
+    // compiler panics
+    string constant assertionPanic = "Panic(1)";
+    string constant arithmeticPanic = "Panic(17)";
+    string constant divisionPanic = "Panic(18)";
+    string constant enumPanic = "Panic(33)";
+    string constant arrayPanic = "Panic(34)";
+    string constant emptyArrayPanic = "Panic(49)";
+    string constant outOfBoundsPanic = "Panic(50)";
+    string constant memoryPanic = "Panic(65)";
+    string constant functionPanic = "Panic(81)";
+}
+```
+
 ## [MockERC20](https://github.com/Recon-Fuzz/setup-helpers/blob/main/src/MockERC20.sol)
 A minimal `MockERC20` contract that lets you mock any standard ERC20 tokens that will be interacting with the system without requiring external dependencies.