Allow marcoscaceres to monitor varous test directories (#37177)

diff --git a/html/user-activation/META.yml b/html/user-activation/META.yml
new file mode 100644
index 0000000..e50fcfc
--- /dev/null
+++ b/html/user-activation/META.yml
@@ -0,0 +1,3 @@
+spec: https://html.spec.whatwg.org/multipage/interaction.html#tracking-user-activation
+suggested_reviewers:
+  - marcoscaceres