added basic snackbar

src/app/services/snackbar.service.ts

@@ -0,0 +1,18 @@
+import { Injectable } from '@angular/core';
+import {MatSnackBar} from '@angular/material/snack-bar'; 
+
+@Injectable({
+  providedIn: 'root',
+})
+export class SnackBarService {
+
+    constructor(private snackBar : MatSnackBar) { } 
+  
+  
+    openSnackBar(message: string, action: string) { 
+        this.snackBar.open(message, action, { 
+            duration: 5000, 
+            panelClass: ['mat-toolbar', 'mat-primary']
+        });
+    } 
+}