Merge pull request #3 from qwc-services/add-requirements

add Requirements section

content/_index.md

@@ -39,6 +39,12 @@ QGIS Web Client 2 (QWC2) and QWC Services on the backend provide a complete Web
 * [Quickstart](/quick-start/)
 * Public viewers: [Demo](http://qwc2.sourcepole.ch) | [Glarus](https://map.geo.gl.ch/) | [Solothurn](https://geo.so.ch/map/) | [qgisweb.oslandia.net](https://qgisweb.oslandia.net/) | [Erft Verband](http://webgis.erftverband.de)
 
+## Requirements
+
+* Requirements depend on the QGIS projects that are being served. The numbers below are estimates.
+* minimum: 2 Cores and 16 GB RAM
+* optimum: 4 Cores und 32 GB RAM
+
 ## Support
 
 * Community support: [Github](https://github.com/qgis/qwc2-demo-app/issues)