Add basic readme

README.md

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+# Rex UI
+
+Rex UI is a simple ui for the [ruby exchange (rex)](https://git.timkaechele.me/timkaechele/rex)
+
+## System dependencies
+
+- Node v19.3.0, this was the node version used to develop the project, newer versions should work as well.
+
+## Installation
+
+Install the dependencies
+
+```bash
+$ npm install
+```
+
+## Running the project
+
+Start a server
+
+```bash
+$ npm run server
+```
+
+The ui tries to connect to the exchange on `localhost:8080`. If you run the exchange on a different host/port you have to change the url in `src/app.jsx`
+
+## Building the project
+
+You can build all dependencies using the following script
+
+```bash
+$ npm run build
+```
+
+## Screenshots
+
+![UI Screenshot](./.screenshots/ui.png)