[main] [Web-Snippet Package] Prepare for release by update readme wit…

…h new functions (#2275)

* Update README.md

* Update README.md

* Update README.md

tools/applicationinsights-web-snippet/README.md

@@ -15,18 +15,21 @@ Add the Application Insights Web Snippet to your app's dependencies and package.
 npm i @microsoft/applicationinsights-web-snippet
 ```
 
-
-Import web snippet from the package.
+### Pass in Key via Function (available since v1.1.0)
+Import the helper function from the package to easily get the snippet
 ```
-import { webSnippet } from "@microsoft/applicationinsights-web-snippet";
+import { getSdkLoaderScript } from "@microsoft/applicationinsights-web-snippet";
 ```
 
-
-Replace "INSTRUMENTATION_KEY" with valid Instrumentation Key.
+Configure the snippet with your connectionString.
 ```
-webSnippet.replace("INSTRUMENTATION_KEY", your_valid_ikey);
+let config = {connectionString: "InstrumentationKey=xxx"}; 
+// or let config = {instrumentationKey: key};
+let theSnippet = getSdkLoaderScript(config);
 ```
 
+
+
 More details on web snippet, see [Web Snippet](https://github.com/microsoft/ApplicationInsights-JS#snippet-setup-ignore-if-using-npm-setup).
 
 ## Build