HTTP POST example added

Author: NickIliev

app/fetch/fetch-examples.component.ts

@@ -7,7 +7,7 @@ import { NativeScriptHttpModule } from "nativescript-angular/http";
 import { HttpExamplesComponent } from "./http-examples.component";
 
 import { HttpGetComponent } from "./http-get/http-get.component";
-import { HttpPostComponent } from "./http-post/http-post";
+import { HttpPostComponent } from "./http-post/http-post.component";
 import { TitleAndNavButtonModule } from "../directives/title-and-nav-button.module";
 
 export const routerConfig = [

app/fetch/fetch-examples.module.ts

@@ -9,9 +9,9 @@ import { NativeScriptHttpModule } from "nativescript-angular/http";
     ]
 ```
 
-Creating a service file to keep our HTTP logic separated from our component file (which does not need to know how we fetch our data)
+Creating a service file to keep our HTTP logic separated from our component file (which does not need to know details on how we fetch our data)
 <snippet id="http-get-service"/>
 
-Finally, we can provide our service in our component. Note that the services should be explicitly declared ```providers: [MyHttpService]```
+Finally, we can provide our service in our component. Note that the services should be explicitly declared in `providers`
 and then should be provided as an argument in our component's constructor
 <snippet id="http-get-component"/>