Change readme

Author: ueler

README.md

@@ -9,3 +9,44 @@ Using npm:
 npm i --save @ueler/ng-lazyload-script
 ```
 
+## Features
+- Provides an Angular service to load javascript files.   
+- The service loads each library only once, i.e. remembers which libraries were already loaded.
+- You can subscribe to the returned observable to execute code relying on the lazy loaded script.
+
+## How does it work?
+The service creates a ``<script>`` tag with the provided source url and appends it to the document body.
+
+## Usage
+1\. Inject the service into your own service or component:
+```
+constructor(private ngLazyloadScriptService: NgLazyloadScriptService) {
+}
+```
+
+2\. Use the service to load an external javascript library (like Google Maps JS API or Stripe JS API).  
+3\. Subscribe to the observable and use the loaded library on success case.
+```
+this.ngLazyloadScriptService.loadScript('URL_TO_JAVASCRIPT_FILE').subscribe(() => {
+  // success case: do something with the loaded library
+}, () => {
+  // error case
+});
+```
+
+
+## Example
+It can be used to load the Stripe Javscript API (https://stripe.com/docs/js):
+```
+this.ngLazyloadScriptService.loadScript('https://js.stripe.com/v3/').subscribe(() => {
+  // use Stripe constructor from loaded library
+  const stripe = Stripe('stripe_public_key', {
+    betas: ['payment_intent_beta_3']
+  });
+
+  // ...
+});
+```
+
+## Compatibility
+The library works with Angular versions ``>=8.0.0``.

projects/ng-lazyload-script/package.json

@@ -1,8 +1,8 @@
 {
   "name": "@ueler/ng-lazyload-script",
-  "version": "0.0.2",
+  "version": "0.0.3",
   "peerDependencies": {
-    "@angular/core": ">=7.0.0",
+    "@angular/core": ">=8.0.0",
     "rxjs": ">=6.0.0"
   },
   "description": "Load external javascript libraries/files (e.g. Google Maps JavaScript API, Stripe JavaScript API, ...) in your components and services on the fly (when you need them) and execute code as soon as it's loaded.",