Prepare README and CHANGELOG for v0.7.x

Author: mpalourdio

CHANGELOG.MD

@@ -1,5 +1,11 @@
 # Changelog
 
+## v0.7.0
+
+This release adds the ``entryComponent`` property. It allows to specify your own component instead of the built-in ones. It uses the [NgComponentOutlet](https://angular.io/api/common/NgComponentOutlet) feature.
+
+See [Defining your own spinner](https://github.com/mpalourdio/ng-http-loader#defining-your-own-spinner) section.
+
 ## v0.6.0
 
 This release adds the ``debounceDelay`` parameter (default is 0). It allows to discard the spinner for fast and repeated http requests, which can be annoying under some conditions.

README.MD

@@ -136,6 +136,18 @@ The different spinners available are referenced in [this class](src/spinkits.ts)
 <spinner backgroundColor="#ff0000" spinner="sk-wave"></spinner>
 ```
 
+## Defining your own spinner
+
+You can define your own component instead of the built-in ones. The steps are:
+
+- Create your own component
+- Add it to the [entryComponent](https://angular.io/guide/ngmodule-faq#what-is-an-entry-component) definition in your module
+- Reference your component in a public property in your ``app.component.ts``
+- Reference the property in the spinner component like this :
+```xml
+<spinner [entryComponent]="myAwesomeComponent"></spinner>
+```
+
 ## Requests filtering
 
 You can also filter the http requests that shouldn't be caught by the interceptor by providing **an array of regex patterns**: