Update README

.gitignore

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-# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
-
 # dependencies
 node_modules
 

README.md

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+# [3cities](https://3cities.xyz/)
 
 [![dev branch](https://github.com/3cities/3cities/actions/workflows/0-build-dev.yml/badge.svg)](https://github.com/3cities/3cities/actions/workflows/0-build-dev.yml)
 [![staging release](https://github.com/3cities/3cities/actions/workflows/1-deploy-main-to-staging.yml/badge.svg)](https://github.com/3cities/3cities/actions/workflows/1-deploy-main-to-staging.yml)
 [![prod release](https://github.com/3cities/3cities/actions/workflows/2-deploy-staging-to-prod.yml/badge.svg)](https://github.com/3cities/3cities/actions/workflows/2-deploy-staging-to-prod.yml)
+
+Get multi-currency, multi-token, multi-L2, self-processing payments in one free, open, embedded widget, with no logins, signups, API keys, or tracking.
+
+3cities is a tool to pay and get paid on Ethereum.
+
+3cities is not a wallet, it's an app that lets you connect your wallet.
+
+3cities is not a token or a chain, it's an app that automatically searches the payment sender's wallet for the best payment method across ten popular tokens and a dozen L2s.
+
+Individuals can use 3cities for send or receive payments, donations, transfers, or deposits.
+
+Merchants can use 3cities to be accept transactional payments and self-process those payments offchain (be your own payment processor). Payments can be in USD or ETH, with EUR and other currencies soon to come.

packages/core/README.md

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-# Overview
+# @3cities/core
 
-TODO
-
-# Usage
+A package for dependencies shared across the 3cities monorepo.