Clarify fast setup instructions only on Linux/macOS (#1524)

Author: jacacthomas

README.md

@@ -20,13 +20,12 @@ PolicyEngine UK enhances this dataset by fusing it to other surveys and reweight
 [^1]: Department for Work and Pensions, Office for National Statistics, NatCen Social Research. (2021). Family Resources Survey, 2019-2020. [data collection]. UK Data Service. SN: 8802, http://doi.org/10.5255/UKDA-SN-8802-1
 
 
-## Fast setup instructions
+## Fast setup instructions (Linux / macOS)
 
 1. Run `pip install policyengine-uk`
 
 2. Run `policyengine-uk` and go through the prompt to setup microdata.
 
-
 ## Contact
 
 The primary maintainer for PolicyEngine UK is Nikhil Woodruff, co-founder and CTO of PolicyEngine (nikhil@policyengine.org).