Add authors to aggregate_key_discovery explainer to align with other … (#1485)

Add authors to aggregate_key_discovery explainer to align with other files

Add authors to aggregate_key_discovery.md

Author: arpanah

aggregate_key_discovery.md

@@ -1,5 +1,12 @@
 # Summary reports with key discovery
 
+## Authors
+
+* Charlie Harrison ([email protected])
+* Hidayet Aksu ([email protected])
+  
+
+## Introduction
 This document describes possible new functionality in the server-side mechanisms for the aggregation service, which allows ad techs to query the Attribution Reporting API’s and Private Aggregation API’s summary reports without [pre-declaring every aggregation bucket](https://github.com/WICG/attribution-reporting-api/blob/main/AGGREGATION_SERVICE_TEE.md#pre-declaring-aggregation-buckets). 
 
 This proposal is backward compatible; ad techs can still work with pre-declared buckets.