DOCSP-44538 Add LangChainGo tutorial link (#234)

Author: stephmarie17

source/languages/go.txt

@@ -31,6 +31,8 @@ other MongoDB language drivers.
 Integrations
 ------------
 
+:atlas:`Get Started with the LangChainGo Integration → </atlas-vector-search/ai-integrations/langchaingo>`
+
 `OpenTelemetry → <https://opentelemetry.io/>`__
 
 `Community-Built Integrations → <https://www.mongodb.com/resources/languages/golang#using-go-and-mongodb-with-other-technologies>`__