CCM-12896: Added a note on generated code to main README.md

Author: gareth-allan

README.md

@@ -76,6 +76,10 @@ Installation and configuration of the toolchain dependencies
 make config
 ```
 
+Note that the `make config` command will also build the flattened event schemas and auto-generate a Typescript
+type and JS validator code for each event. See the [typescript-schema-generator](src/typescript-schema-generator/)
+package for more details.
+
 ## Usage
 
 ### Testing