docs(levm): mention solidity compiler dependency for levm benchmark tool (#2906)

**Motivation**
Following the `rev_comparison` levm bench tool's README to run the tool
results in an error as the solidity compiler is not installed. This is
not mentioned as a dependency, so this PR updates the README to mention
that solidity compiler is required to use the tool and how to install
it.
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**Description**
* Mention solidity compiler dependency + how to install it on levm's
`rev_comparison` benchmark tool README
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introduces -->

<!-- Link to issues: Resolves #111, Resolves #222 -->

Closes #issue_number

Author: fmoletta

crates/vm/levm/bench/revm_comparison/README.md

@@ -2,10 +2,20 @@
 This README explains how to run benchmarks to compare the performance of `levm` and `revm` when running different contracts. The benchmarking tool used to gather performance metrics is [hyperfine](https://github.com/sharkdp/hyperfine), and the obtained results will be included for reference.
 
 To run the benchmarks (from `levm`'s root):
+
 ```bash
 make revm-comparison
 ```
 
+Note that first you will need to install the solidity compiler
+On mac you can use homebrew:
+
+```bash
+brew install solidity
+```
+
+For other installation methods check out the [official solidity installation guide](https://docs.soliditylang.org/en/latest/installing-solidity.html)
+
 ## Factorial
 This program computes the nth factorial number, with n passed via calldata. We chose 1000 as n and ran the program on a loop 100,000 times.