feat: add history functionality

src/app/api/history.service.ts

@@ -9,7 +9,15 @@ export class HistoryService
 {
   historyArray: HistoryRecord[] = []
   
-  constructor(private storage: Storage) { }
+  constructor(private storage: Storage){
+    storage.get('history').then((val) =>
+    {
+      if(val)
+      {
+        this.historyArray = JSON.parse(val);
+      }
+    });
+  }
 
   public saveRecord(record: HistoryRecord)
   {

src/app/tab2/tab2.page.html

@@ -7,5 +7,9 @@
 </ion-header>
 
 <ion-content [fullscreen]="true">
-
+  <ion-list>
+    <ion-item *ngFor="let record of historyArray; let i = index">
+      <ion-label>{{ record.inputHistory }} <ion-icon name="arrow-forward-outline"></ion-icon> {{ record.outputHistory }}</ion-label>
+    </ion-item>
+  </ion-list>
 </ion-content>