Add integration with Foundry instead of Python in README.md

[StackOverflowExcept1on]

Idea is to use Foundry, toolkit for Solidity smart contracts, as it has Solidity REPL where you can easily do modulo addition/multiplication on 256-bit numbers, and also use jq to extract some data.

Foundry: https://getfoundry.sh

Desktop of user who is mining address:

apt update
apt install --yes curl git jq

export PATH="${PATH}:~/.foundry/bin"
curl -L https://foundry.paradigm.xyz | bash && foundryup

PRIVATE_KEY=$(cast wallet --json new | jq --raw-output ".[0].private_key")
echo "$PRIVATE_KEY"

PUBLIC_KEY=$(cast wallet public-key --raw-private-key "$PRIVATE_KEY")
echo "$PUBLIC_KEY"

Output:

0x5ac283cd4b83a1333b9e4f77a4d8436c2eaa1c5f67eec19e65f799fd0f7b65fb
0xad160289231b58a976a020bd125b23cc1b41af913d5bbd647d20c3730e8ef2d66111213912525f510da2b07f1946545f8c9bc4ec84c86a3716e59f6375f5c692

Server with GPU

apt update
apt install --yes build-essential git ocl-icd-opencl-dev

git clone https://github.com/1inch/profanity2.git
cd profanity2 || exit
make

export PUBLIC_KEY="0xad160289231b58a976a020bd125b23cc1b41af913d5bbd647d20c3730e8ef2d66111213912525f510da2b07f1946545f8c9bc4ec84c86a3716e59f6375f5c692"
./bin/profanity2.x64 --matching 77777777XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX -z ${PUBLIC_KEY#0x}

export PRIVATE_KEY="0x5ac283cd4b83a1333b9e4f77a4d8436c2eaa1c5f67eec19e65f799fd0f7b65fb"
export VANITY_PRIVATE_KEY="0x000000e97f76951e8f71b807a86bdcd57ac3a215c08dc1031db98a001a370460"
ACTUAL_VANITY_PRIVATE_KEY=$(chisel --json eval "bytes32(addmod(uint256($PRIVATE_KEY), uint256($VANITY_PRIVATE_KEY), 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141))" | tail -n 1 | awk -F': ' '{print $2}')
echo "$ACTUAL_VANITY_PRIVATE_KEY"
cast wallet addr --private-key "$ACTUAL_VANITY_PRIVATE_KEY"

Output:

0x5ac284b6cafa3651cb10077f4d442041a96dbe75287c82a183b123fd29b26a5b
0x77777777E60E10df54Dd19905814D034A3b7D421

[StackOverflowExcept1on]

@galekseev