Update README.md

README.md

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 Demographic data and measures for the Social Impact Data Commons
 
 Testing
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+
+
+Data repo structure
+
+ - Age /distribution 
+      va_trctbg_acs_20092020_age_demographics.csv.xz
+      ncr_trctbg_acs_20092020_age_demographics.csv.xz
+      va059_hsrpdsdzc_sdad_2019_age_demographics.csv.xz
+      va013_civic_sdad_2019_age_demographics.csv.xz
+
+ - Gender /distribution
+      va_trctbg_acs_20092020_gender_demographics.csv.xz
+      ncr_trctbg_acs_20092020_gender_demographics.csv.xz
+      va059_hsrpdsdzc_sdad_2019_gender_demographics.csv.xz
+      va013_civic_sdad_2019_gender_demographics.csv.xz
+
+ - Race /distribution
+      va_trctbg_acs_20092020_race_demographics.csv.xz
+      ncr_trctbg_acs_20092020_race_demographics.csv.xz
+      va059_hsrpdsdzc_sdad_2019_race_demographics.csv.xz
+      va013_civic_sdad_2019_race_demographics.csv.xz
+
+ - Language /distribution
+      va_trctbg_acs_20092020_language_demographics.csv.xz
+      ncr_trctbg_acs_20092020_language_demographics.csv.xz
+      va059_hsrpdsdzc_sdad_2019_language_demographics.csv.xz
+      va013_civic_sdad_2019_language_demographics.csv.xz
+
+
+
+Synthetic estimation
+
+Refinement:
+  - Estimate demographics at the parcel/ssl for DC, Fairfax and Arlington,
+  - Assumptions
+    1.Population is distributed at the parcel/ssl level according to the number of living units
+    2.living units distribution across parcels is fixed
+      update version: consider the year when a parcel is created and build a dynamic version of parcels
+
+  - data (not distributed)
+
+Expansion:
+  - estimate demographic for new geographies (civic association, human services, planning district, zip code)
+
+
+