[Docs] Add GettingStarted.md to index.md

GitOrigin-RevId: e2ddb22a00510314e5b7216f313d975d1705cf73
diff --git a/docs/index.md b/docs/index.md
index d6b0511..b91fb45 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -26,6 +26,7 @@
    C++style
    FortranForCProgrammers
    GettingInvolved
+   GettingStarted
    ImplementingASemanticCheck
    PullRequestChecklist
 ```