Add entities covered in assumptions.

Author: cjbayesian

app.py

@@ -92,7 +92,7 @@
 
 ### Initial Conditions
 
-- The total size of the susceptible population will be the entire catchment area for Penn Medicine entities
+- The total size of the susceptible population will be the entire catchment area for Penn Medicine entities (HUP, PAH, PMC, CCH)
   - Delaware = {delaware}
   - Chester = {chester}
   - Montgomery = {montgomery}