Add subjects section in Home page

explore/src/app/home/home.component.html

@@ -206,6 +206,18 @@
   <numbers #numbersComponent [defaultInit]="false" backgroundClass="numbers-background"
            (results)="numbers = $event"></numbers>
 </div>
+<div class="uk-section uk-padding-large uk-grid uk-child-width-1-2@m uk-child-width-1-1@s  uk-margin-large-top uk-margin-large-bottom">
+  <div class="uk-flex uk-flex-middle uk-flex-center">
+    <h3 class="uk-text-center uk-margin-medium-bottom">Start browsing by subject</h3>
+  </div>
+  <div>
+    <div class="uk-text-center uk-padding-large uk-padding-remove-vertical ">
+      <span *ngFor="let subject of specialSubjects " class=" uk-text-capitalize uk-link-reset uk-button uk-button-default uk-button-secondary uk-margin-small-right uk-margin-small-bottom">
+      <a [routerLink]=" properties.searchLinkToAdvancedResults"
+         [queryParams]="getSubjectParameter(subject.value)  ">{{subject.label}}</a></span>
+    </div>
+  </div>
+</div>
 <!--<div class="uk-section uk-padding-remove-bottom">
   <div class="uk-container uk-text-center uk-margin-medium-bottom">
     <div class="uk-margin-medium uk-flex-center">

explore/src/app/home/home.component.ts

@@ -20,6 +20,7 @@ import {HelperService} from "../openaireLibrary/utils/helper/helper.service";
 import {Filter} from "../openaireLibrary/searchPages/searchUtils/searchHelperClasses.class";
 import {properties} from "../../environments/environment";
 import {Numbers, NumbersComponent} from "../openaireLibrary/sharedComponents/numbers/numbers.component";
+import {StringUtils} from "../openaireLibrary/utils/string-utils.class";
 
 @Component({
   selector: 'home',
@@ -146,7 +147,24 @@ export class HomeComponent {
   };
   public pageContents = null;
   @ViewChild("numbersComponent", { static: true }) numbersComponent: NumbersComponent;
-  
+  specialSubjects = [
+    {value: "Physics::Atomic Physics", label: "Atomic Physics"},
+    {value: "Mathematics::Combinatorics", label: "Mathematics Combinatorics"},
+    {value: "lcsh:Medicine", label: "Medicine"},
+    {value: "lcsh:Science", label: "Science"},
+    {value: "lcsh:Biology (General)", label: "Biology"},
+    {value: "lcsh:Chemistry", label: "Chemistry"},
+    {value: "lcsh:Engineering (General). Civil engineering (General)", label: "Civil engineering"},
+    {value: "lcsh:Technology", label: "Technology"},
+ /*   "Mathematics::Combinatorics",
+    "lcsh:Medicine",
+    "lcsh:Science",
+    "lcsh:Biology (General)",
+    "lcsh:Chemistry",
+    "lcsh:Engineering (General). Civil engineering (General)",
+    "lcsh:Technology"*/
+  ];
+  stringUtils = new StringUtils();
   constructor(
     private route: ActivatedRoute,
     private _router: Router,
@@ -285,4 +303,7 @@ export class HomeComponent {
     }
     this._router.navigate([url], {queryParams: this.routerHelper.createQueryParams(parameterNames, parameterValues)});
   }
+  getSubjectParameter(param){
+    return {'f0':'resultsubject','fv0':'"' +(param)+'"'};
+  }
 }