docs(readmr): create readme file

README.md

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+# nxtp-js
+
+nxtp-js is a JavaScript implementation of the nxtp library, developed for the ZX Spectrum Next computer. It provides a convenient method for configuring the local time on vintage computers that possess both a Real Time Clock (RTC) and a network interface.
+
+This library is inspired by the original [nxtp](https://github.com/Threetwosevensixseven/nxtp) project for the ZX Spectrum Next.
+
+
+
+## Installation
+
+To use this project, you need to have Node.js version 18 or higher installed. As an alternative you can use nvm.
+
+
+```shell
+git clone https://github.com/syroegkin/nxtp-js.git
+nvm use # if you use nvm
+npm install
+npm run build
+npm start
+```
+
+By default, the library listens on port 12300. However, you can configure a different port by setting the environment variable **PORT**:
+
+```shell
+PORT=12500 npm start
+```
+
+The public time server is available at http://time.zx.in.net:12300
+
+ZX Spectrum Next is a trademark of SpecNext Ltd.