Added tokei.rs badge (#836)

[![lines of
code](https://tokei.rs/b1/github/databricks/databricks-sdk-go)]([https://codecov.io/github/databricks/databricks-sdk-go](https://github.com/databricks/databricks-sdk-go))

README.md

@@ -1,5 +1,7 @@
 # Databricks SDK for Go
 
+[![lines of code](https://tokei.rs/b1/github/databricks/databricks-sdk-go)]([https://codecov.io/github/databricks/databricks-sdk-go](https://github.com/databricks/databricks-sdk-go))
+
 [Beta](https://docs.databricks.com/release-notes/release-types.html): This SDK is supported for production use cases,
 but we do expect future releases to have some interface changes; see [Interface stability](#interface-stability).
 We are keen to hear feedback from you on these SDKs. Please [file issues](https://github.com/databricks/databricks-sdk-go/issues), and we will address them