README.md: add brief intro

Author: raffaele-filiberti

README.md

@@ -0,0 +1,18 @@
+# iOS Silent Hack
+
+iOS Silent Hack is a library that allows you to play audio context even if the user has the Silent switch on.
+You'll need to wait for an user interaction to check if the audio context is allowed.
+
+## Usage
+
+```js
+import SilentHack from '@activetheory/ios-silent-hack';
+
+const silentHack = new SilentHack();
+
+// after the library is initialized, you can check if the audio context is allowed
+console.log(silentHack.allowed);
+
+// if you want to remove the event listeners after the audio context is allowed, you can call the destroy method
+silentHack.destroy();
+```