Merge pull request #136 from ethereum-optimism/supersim-why

Add why supersim section

README.md

@@ -25,6 +25,13 @@ Supersim allows developers to start multiple local evm nodes with one command, a
 
 Supersim is a lightweight tool that simulates an interoperable Superchain environment locally. It does not require a complicated devnet setup and is run using cli commands with configuration options that fall back to sensible defaults if they are not specified. Each chain is an instance of [anvil](https://book.getfoundry.sh/reference/anvil/), though future versions may support other local testing tools.
 
+### Why Supersim?
+
+While existing tools focus on isolated smart contract testing, Supersim takes a quantum leap forward by providing a holistic, local development environment that mirrors the complex interactions of the Superchain ecosystem. Imagine having the power to simulate entire cross-chain application flows, complete with deployed contracts, intricate message passing infrastructure, and OP-Stack specific logic. Supersim makes this a reality. 
+
+As we move towards a multi-chain future, the ability to develop and test applications that seamlessly operate across different layers and chains becomes crucial. Supersim provides a consistent and reliable environment that mimics real-world Superchain interactions. By leveraging Supersim, developers can focus on building groundbreaking applications, rather than grappling with the intricacies of cross-chain testing environments. This tool doesn't just make development easier; it unlocks new possibilities for innovation in the Superchain ecosystem.
+
+
 ## Getting started
 ### Running Locally
 1. build the binary by running: