updated readme

README.md

@@ -2,6 +2,17 @@
 
 Simple Flask based application to receive impulses via cURL from a power meter.
 
+Clone this repository and create a virtualenv within it:
+
+```
+git clone https://github.com/Finn10111/powermeter.git
+cd powermeter
+virtualenv -p /usr/bin/python3 .
+# or if python3 is your default:
+virtualenv .
+pip install -r requirements.txt
+```
+
 For developing run this (you need to create database and user first):
 
 ```