docs: add git config user.* to commit successfully (#1877)

Author: bearomorphism

docs/images/commit.tape

@@ -53,6 +53,10 @@ Sleep 500ms
 # Initialize git repository
 Type "git init"
 Enter
+Type "git config user.email 'you@example.com'"
+Enter
+Type "git config user.name 'Your Name'"
+Enter
 Sleep 500ms
 
 Type "git checkout -b awesome-feature"