update README.md

README.md

@@ -1,5 +1,6 @@
 # `webpush` - Web Push library for Deno and other web compatible runtime.
 
+![jsr badge](https://jsr.io/badges/@negrel/webpush)
 ![license MIT badge](https://img.shields.io/github/license/negrel/webpush)
 ![code size badge](https://img.shields.io/github/languages/code-size/negrel/webpush)
 
@@ -11,6 +12,8 @@
 > I've done my best to follow RFC recommandation and I only used primitives
 > provided by the SubtleCrypto API.
 
+`webpush` is available on [JSR](https://jsr.io/@negrel/webpush).
+
 ## Getting started
 
 Before sending Web Push message to a user agent, you need to create VAPID keys
@@ -51,6 +54,8 @@ $ cd example/
 $ deno run -A ./main.ts
 ```
 
+Code is commented be sure to read it.
+
 ## Dependencies
 
 This library tries its best at keeping the minimum number of dependencies. It