Update README

README.md

@@ -10,11 +10,16 @@ The `develop` branch is under active development. Find the latest release [here]
 
 This repository contains:
 
-- [Housing characteristics of the U.S. residential building stock](https://github.com/NREL/resstock/tree/main/project_national/housing_characteristics), in the form of conditional probability distributions stored as tab-separated value (.tsv) files. Comments at the bottom of each file document data sources and assumptions for each.
+- [Housing characteristics of the U.S. residential building stock](https://github.com/NREL/resstock/tree/main/project_national/housing_characteristics), in the form of conditional probability distributions stored as tab-separated value (.tsv) files. Comments at the bottom of each file document data sources and assumptions for each. [Resources files](https://github.com/NREL/resstock/tree/main/project_national/resources) available to provide the national saturation of each housing characteristic and a summary report of the data sources and assumptions from all tsvs.  
 - [A library of housing characteristic "options"](https://github.com/NREL/resstock/blob/main/resources/options_lookup.tsv) that translate high-level characteristic parameters into arguments for OpenStudio measures, and which are referenced by the housing characteristic .tsv files and building energy upgrades defined in project definition files
 - Project definition files:
   - v2.3.0 and later: [buildstockbatch YML files openable in any text editor](https://github.com/NREL/resstock/blob/main/project_national/national_baseline.yml)
   - v2.2.5 and prior: [Project folder openable in PAT](https://github.com/NREL/resstock/tree/v2.2.5/project_singlefamilydetached)
+- Resources for the project definition files:
+  - [Dwelling unit count lookup for `n_buildings_represented`](https://github.com/NREL/resstock/blob/main/resources/CensusTableB25001-dwelling_unit_counts.tsv)
+  - [Data dictionary of simulation result columns](https://github.com/NREL/resstock/blob/main/resources/data/dictionary)
+  - [Cambium emissions scenarios](https://github.com/NREL/resstock/blob/main/resources/data/emissions)
+  - [Utility bills calculation](https://github.com/NREL/resstock/blob/main/resources/data/utility_bills)
 - Unit-level OpenStudio Measures for automatically constructing OpenStudio Models of each representative dwelling unit model:
   - v3.0.0 and later: [OpenStudio-HPXML Measures](https://github.com/NREL/resstock/tree/main/resources/hpxml-measures)
   - v2.5.0 and prior: [OpenStudio Measures](https://github.com/NREL/resstock/tree/v2.5.0/resources/measures)