edit readme

README.md

@@ -1,2 +1,36 @@
 # tick3t-api
-tick3t-api
+
+A REST API for tick3t.
+
+**Technologies**:
+
+- Node.js
+- express
+- mongodb
+
+## Installation
+
+1. Install `Node.js` and `npm`.
+2. Install `mongodb`.
+3. Clone this repository.
+4. Install dependencies with `npm install`
+5. Create env file or set environment variables. (read "Environment variables" paragraph)
+6. Build with `npm run build`.
+7. Start the server with `npm run serve`.
+
+### Environment variables
+
+Configure the environment variables:
+
+```text
+NODE_ENV=production  
+PORT=server-port  
+SECRET_KEY=your-secret-key  
+DB_URL=mongodb://your-host:port/db  
+DB_USER=your-user  
+DB_PASSWORD=your-password
+```
+
+## License
+
+GPLv3