Added more error handling and necessary functions

content.go

@@ -28,6 +28,6 @@ func NewContent(contentType int, mediaType string, content any) (Content, error)
 	case 3:
 		return newOutOfLineContent(mediaType, content)
 	default:
-		return nil, fmt.Errorf("%v is not a valid text type", contentType)
+		return nil, fmt.Errorf("error creating new content: %v is not a valid text type", contentType)
 	}
 }