updated readme

NEED/README.md

@@ -9,7 +9,15 @@ http://discover.ukdataservice.ac.uk/catalogue/?sn=7518
 * Detailed documentation: https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/332169/need_anonymised_dataset_accompanying_documentation.pdf
 * Full coding details of variables at: https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/315189/need_dataset_look_ups.xlsx
 
-Notes (mostly to self):
+###Terms of Use
+GPL: V2 - http://choosealicense.com/licenses/gpl-2.0/
+
+See license file for details.
+
+[YMMV](http://en.wiktionary.org/wiki/YMMV)
+
+Notes (mostly to self)
+----------------------
 * gas kwh are weather corrected within the 10 DNO distribution zones before delivery to DECC
 * The End User License file (EULF) dataset is a sample of just over 4 million households 
 * EULF is a semi-random sample of the 8m records which have an Energy Performance Certificate. 
@@ -34,14 +42,9 @@ Notes (mostly to self):
  * V	Valid electricity consumption (between 100 and 25,000 inclusive)
 
 Notes to DECC (!)
+-----------------
 * ideally could set missing to -99 to aid re-coding and avoid unpleasant surprises in naive analysis?
 * can the consumption rounding be constant through the distributions?
 * check coding of Gcons ref 0 values for 'valid' cases?
 * distinguish between electric & 'other' heating in 'main heating fuel'?
 
-###Terms of Use
-GPL: V2 - http://choosealicense.com/licenses/gpl-2.0/
-
-See license file for details.
-
-[YMMV](http://en.wiktionary.org/wiki/YMMV)