Add s3 to config template.

config.properties

@@ -63,6 +63,12 @@ MATRIX_SERVER:https://matrix-client.matrix.org
 # Geo Restriction Checker for federated bypassing of Geo Restrictions
 #GEO_RESTRICTION_CHECKER_URL:INSERT_HERE
 
+# S3 Configuration Data (compatible with any provider that offers an S3 compatible API)
+#S3_ENDPOINT:INSERT_HERE
+#S3_ACCESS_KEY:INSERT_HERE
+#S3_SECRET_KEY:INSERT_HERE
+#S3_BUCKET:INSERT_HERE
+
 # Hibernate properties
 hibernate.connection.url:jdbc:postgresql://postgres:5432/piped
 hibernate.connection.driver_class:org.postgresql.Driver