Update repo init instruction

Add flag to pull internal ML model zoo.

Change-Id: I9c67d6c2f677eb98bc32a4c041117dd433b1fffb

GettingStarted.md

diff --git a/GettingStarted.md b/GettingStarted.md
index 55f132f..b5362cc 100644
--- a/GettingStarted.md
+++ b/GettingStarted.md
@@ -37,7 +37,7 @@
 current release branch.
 
 ```
-repo init -u https://spacebeaker.googlesource.com/shodan/manifest
+repo init -u https://spacebeaker.googlesource.com/shodan/manifest -g default,internal
 repo sync -j$(nproc)
 ```