Add localstorage service

src/app/services/localstorage.service.ts

@@ -0,0 +1,23 @@
+import { Injectable } from '@angular/core';
+
+@Injectable({
+    providedIn: 'root'
+})
+export class LocalStorageService {
+
+    private readonly AUTH_TOKEN_KEY = 'auth_token';
+
+    constructor() { }
+
+    setToken(token: string): void {
+        localStorage.setItem(this.AUTH_TOKEN_KEY, token);
+    }
+
+    getToken(): string | null {
+        return localStorage.getItem(this.AUTH_TOKEN_KEY);
+    }
+
+    removeToken(): void {
+        localStorage.removeItem(this.AUTH_TOKEN_KEY);
+    }
+}