I need a straightforward, text-only chatting module that delivers real-time message notifications. The core requirements are: • One-to-one and simple group text conversation • Instant delivery and read receipts (websockets, Firebase, or similar real-time tech) • Push or in-app alerts so users never miss a new message I’m flexible on the final platform—website, mobile, or desktop—so long as the solution is cleanly documented and easy for me to integrate into an existing code-base. A lightweight, secure back-end and a simple front-end interface are all that’s required; no voice or video support is needed. Please outline the framework or language you propose, any third-party services you plan to use, and the rough timeline for handing over working source code, setup instructions, and a quick demo showing notifications in action.