chore(doc): add sqlc documentation

README.md

@@ -27,3 +27,15 @@ $ tern new --migrations ./internal/store/pgstore/migrations create_messages_tabl
 
 `tern.config` does not read `.env` file directly so a wrapper was created to be
 able to load environment variables.
+
+### Installing sqlc
+
+```bash
+$ go install github.com/sqlc-dev/sqlc/cmd/sqlc@latest
+```
+
+### Generate sql types
+
+```bash
+$ sqlc generate -f ./internal/store/pgstore/sqlc.yaml
+```