Update README. Closes PR #13

Author: Kim Biesbjerg

README.md

@@ -1,10 +1,18 @@
 # Description
 Load po files for use with `ngx-translate`
 
+## Installation:
+
+ ```
+ +npm i @ngx-translate/core --save
+ +npm i @biesbjerg/ngx-translate-po-http-loader --save
+ ```
+
 ## Usage:
 ```ts
 import { HttpClient, HttpClientModule } from '@angular/common/http';
 
+import { TranslateModule, TranslateLoader } from '@ngx-translate/core';
 import { TranslatePoHttpLoader } from '@biesbjerg/ngx-translate-po-http-loader';
 
 export function createTranslateLoader(http: HttpClient) {