Add error dialog box.

- Add service for handling creation of error dialog.
- Refactor directory layout.

src/app/shared/shared.module.ts

@@ -8,6 +8,8 @@ import { MenuToggleDirective } from '@app/shared/_directives/menu-toggle.directi
 import {RouterModule} from '@angular/router';
 import {MatIconModule} from '@angular/material/icon';
 import {TokenRatioPipe} from '@app/shared/_pipes/token-ratio.pipe';
+import { ErrorDialogComponent } from './error-dialog/error-dialog.component';
+import {MatDialogModule} from '@angular/material/dialog';
 
 
 
@@ -18,7 +20,8 @@ import {TokenRatioPipe} from '@app/shared/_pipes/token-ratio.pipe';
     SidebarComponent,
     MenuSelectionDirective,
     MenuToggleDirective,
-    TokenRatioPipe
+    TokenRatioPipe,
+    ErrorDialogComponent
   ],
   exports: [
     TopbarComponent,
@@ -27,10 +30,11 @@ import {TokenRatioPipe} from '@app/shared/_pipes/token-ratio.pipe';
     MenuSelectionDirective,
     TokenRatioPipe
   ],
-    imports: [
-        CommonModule,
-        RouterModule,
-        MatIconModule
-    ]
+  imports: [
+    CommonModule,
+    RouterModule,
+    MatIconModule,
+    MatDialogModule,
+  ]
 })
 export class SharedModule { }