feat: add term start configuration

src/components/admin/term-start-date/term-start-date.component.html

@@ -0,0 +1,12 @@
+<app-configuration-card
+  [title]="'Дата начала семестра'"
+  [isSaveEnabled]="startDate != startDateBefore"
+  [saveFunction]="saveFunction()"
+  (onSaveFunction)="onSave($event)">
+  <mat-form-field color="accent">
+    <mat-label>Дата начала семестра</mat-label>
+    <input matInput [matDatepicker]="datePicker" [(ngModel)]="startDate" [min]="ValidMinDate">
+    <mat-datepicker-toggle matSuffix [for]="datePicker"></mat-datepicker-toggle>
+    <mat-datepicker #datePicker></mat-datepicker>
+  </mat-form-field>
+</app-configuration-card>