added readme

README.md

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+# SSR Tracing Backend
+This is the backend API provider for the [SSR Tracing Web-App](https://github.com/naresh97/ssr-tracing).
+
+## Development
+### Prerequisites
+- NodeJS
+- NPM
+
+### Building
+- Run `npm install` to install the required packages
+- Run `nodejs ./index.js` to start the server
+
+### .env
+Server parameters are specified in the *.env* file, see *.env.template* for an example