Feat: add new spreadsheet to the readme and share new spreadsheet schema (#1110)

Author: jcpitre

README.md

@@ -6,6 +6,9 @@
 
 The Mobility Feed API service a list of open mobility data sources from across the world. This repository is the effort the initial effort to convert the current [The Mobility Database Catalogs](https://github.com/MobilityData/mobility-database-catalogs) in an API service. [More info about the Mobility Database can be found on the website](https://mobilitydatabase.org/).
 
+The contents of the database is available in csv format [here](https://files.mobilitydatabase.org/feeds_v2.csv). This includes all feeds, including ones we automatically import from sources outside the catalogs repo.
+
+The schema for the csv file is available [here](docs/SpreadsheetSchemaV2.md).
 
 ## GBFS Feeds
 The repository also includes GBFS feeds extracted from [`systems.csv`](https://github.com/MobilityData/gbfs/blob/master/systems.csv) in the [GBFS repository](https://github.com/MobilityData/gbfs). However, these feeds are not being served yet. The supported versions of these feeds are specified in the file [api/src/scripts/gbfs_utils/gbfs_versions.py](https://github.com/MobilityData/mobility-feed-api/blob/main/api/src/scripts/gbfs_utils/gbfs_versions.py).