zhunhan:add internalUsageAttributionId to examples and README.

Author: zhunhan

README.md

@@ -39,6 +39,9 @@ npm i -D @types/google.maps
 
 The reference documentation can be found at this [link](https://googlemaps.github.io/js-api-loader/index.html). The Google Maps JavaScript API [documentation](https://developers.google.com/maps/documentation/javascript/tutorial) is the authoritative source for the loader options.
 
+## Internal usage attribution ID
+
+This library uses `internalUsageAttributionIds`, which helps Google understand which libraries and samples are helpful to developers and is optional. Instructions for opting out of the identifier are provided in reference documentation.
 
 ## Example
 
@@ -59,6 +62,14 @@ const mapOptions = {
   zoom: 4
 };
 
+// Adds a usage attribution ID to the initializer, which helps Google understand which libraries and samples are helpful to developers, such as usage of this library.
+// To opt out of sending the usage attribution ID, it is safe to set the const to false or replace the value with an empty string.
+const useIneternalUsageAttributionId = true;
+const internalUsageAttributionId = "GMP_LIB_JS_API_LOADER";
+
+if (useIneternalUsageAttributionId) {
+  mapOptions.internalUsageAttributionIds = [internalUsageAttributionId];
+}
 ```
 
 Using a promise for a specific library.

examples/index.html

@@ -50,6 +50,16 @@
         zoom: 4,
         mapId: "DEMO_MAP_ID"
       };
+      
+      // Adds a usage attribution ID to the initializer, which helps Google understand which libraries and samples are helpful to developers, such as usage of this library.
+      // To opt out of sending the usage attribution ID, it is safe to set the const to false or replace the value with an empty string.
+      
+      const useInternalUsageAttributionId = true;
+      const internalUsageAttributionId = "GMP_LIB_JS_API_LOADER";
+      
+      if (useInternalUsageAttributionId) {
+        mapOptions.usageAttributionIds = [internalUsageAttributionId];
+      }
 
       const loader = new google.maps.plugins.loader.Loader({
         apiKey: "",