move credential provider to github

extensions/github/package.nls.json

@@ -1,5 +1,6 @@
 {
 	"displayName": "GitHub",
 	"description": "GitHub",
+	"config.gitAuthentication": "Controls whether to enable automatic GitHub authentication for git commands within VS Code.",
 	"welcome.publishFolder": "You can also directly publish this folder to a GitHub repository.\n[$(github) Publish to GitHub](command:github.publish)"
 }