Add new createTransaction method

frontend/src/app/Services/token.service.ts

@@ -6,20 +6,42 @@ const USER_KEY = 'auth-user';
 })
 export class TokenStorageService {
   constructor() {}
+
+  /**
+   * @returns void
+   */
   signOut(): void {
     window.sessionStorage.clear();
   }
+
+  /**
+   * @param  {string} token
+   * @returns void
+   */
   public saveToken(token: string): void {
     window.sessionStorage.removeItem(TOKEN_KEY);
     window.sessionStorage.setItem(TOKEN_KEY, token);
   }
+
+  /**
+   * @returns string
+   */
   public getToken(): string | null {
     return window.sessionStorage.getItem(TOKEN_KEY);
   }
+
+  /**
+   * @param  {any} user
+   * @returns void
+   */
   public saveUser(user: any): void {
     window.sessionStorage.removeItem(USER_KEY);
     window.sessionStorage.setItem(USER_KEY, JSON.stringify(user));
   }
+
+  /**
+   * @returns any
+   */
   public getUser(): any {
     const user = window.sessionStorage.getItem(USER_KEY);
     if (user) {