Add nvm and Node.js installation instructions

[Copilot]

Adds development environment setup documentation for Node.js v24 using nvm, required for Ethereum EIP testing and development tools.

Changes

• New "Setting Up Your Development Environment" section with step-by-step nvm installation and Node.js v24 setup
• Security note referencing official nvm repository for script verification
• Version verification commands for Node.js (v24.12.0) and npm (11.6.2)

# Install nvm
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.3/install.sh | bash
. "$HOME/.nvm/nvm.sh"

# Install and verify Node.js 24
nvm install 24
node -v  # Should print "v24.12.0"
npm -v   # Should print "11.6.2"

Positioned before the contribution workflow to ensure developers have required tooling before forking the repository.

Original prompt

Download and install nvm:

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.3/install.sh | bash

in lieu of restarting the shell

. "$HOME/.nvm/nvm.sh"

Download and install Node.js:

nvm install 24

Verify the Node.js version:

node -v # Should print "v24.12.0".

Verify npm version:

npm -v # Should print "11.6.2".

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[Darliewithrow]

Install nvm

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.3/install.sh | bash
. "$HOME/.nvm/nvm.sh"

Install and verify Node.js 24

nvm install 24
node -v # Should print "v24.12.0"
npm -v # Should print "11.6.2"

[Darliewithrow]

git push -u origin main

[Darliewithrow]

git push -u origin main