Improve code quality and add comments

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

@@ -8,6 +8,7 @@ export class TokenStorageService {
   constructor() {}
 
   /**
+   * Function to sign out user
    * @returns void
    */
   signOut(): void {
@@ -15,6 +16,7 @@ export class TokenStorageService {
   }
 
   /**
+   * Function to save token
    * @param  {string} token
    * @returns void
    */
@@ -24,6 +26,7 @@ export class TokenStorageService {
   }
 
   /**
+   * Function to get token
    * @returns string
    */
   public getToken(): string | null {
@@ -31,6 +34,7 @@ export class TokenStorageService {
   }
 
   /**
+   * Function to save user
    * @param  {any} user
    * @returns void
    */
@@ -40,6 +44,7 @@ export class TokenStorageService {
   }
 
   /**
+   * Function to get user
    * @returns any
    */
   public getUser(): any {