Add Readme example to example_test.go (#298)

* Add speech to text example in docs

* Add caption formats for audio transcription

* Add caption example to README

* Address sanity check errors

* Add tests for decodeResponse

* Use typechecker for audio response format

* Decoding response refactors

* Migrated examples to example_test.go

* Add some executable examples

* Update error docs

* Avoid linting example files which break conventions

* Restore README examples

* Enable linting for example_test

common.go

@@ -1,6 +1,7 @@
-// common.go defines common types used throughout the OpenAI API.
 package openai
 
+// common.go defines common types used throughout the OpenAI API.
+
 // Usage Represents the total token usage per request to OpenAI.
 type Usage struct {
 	PromptTokens     int `json:"prompt_tokens"`