updates readme

README.md

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 # in-n-out-clients
-clients for In-N-Out
+
+A package to universalise reading and writing from different data sources. This forms the backend for [in-n-out](https://github.com/namiyousef/in-n-out), a fastapi app for easy reading and writing from different databases.
+
+## Currenlty Supported Datasources
+
+| Data Source      | Support |
+| ----------- | ----------- |
+| Postgres      | Full read-write support including table/row conflict resolution [[article]](https://towardsdatascience.com/how-to-read-write-dataframes-from-to-sql-over-http-with-fastapi-e48ab91e6a83)       |
+| Google Calendar   | Full read-create support including conflict resolution [[article]](https://namiyousef96.medium.com/writing-to-google-calendar-with-support-for-conflict-resolution-be27c1600e7e)       |
+