added constants

src/constants/keyCodeConstants.ts

+export const PERIOD_SYMBOL = 190;
+export const COMMA_SYMBOL = 188;
+export const PLUS_SYMBOL = 187;
+export const MINUS_SYMBOL = 189;
+export const NUMPAD_PERIOD_SYMBOL = 110;
+export const NUMPAD_MINUS_SYMBOL = 109;
+export const NUMPAD_PLUS_SYMBOL = 107;
+export const K_KEYCODE = 75;
+export const DOWN_ARROW_KEYCODE = 38;
+export const UP_ARROW_KEYCODE = 40;
+export const RIGHT_ARROW_KEYCODE = 39;
+export const LEFT_ARROW_KEYCODE = 37;
+export const BACKSPACE_KEYCODE = 8;
+export const TAB_KEYCODE = 9;

src/constants/localStorage.ts

+export const JWT_TOKEN = 'JwtToken';
+export const JWT_REFRESH_TOKEN = 'JwtRefreshToken';
+export const REFRESH_TOKEN_CONST = 'RefreshToken';

src/constants/pages.ts

+export const BASE_PAGE = '/';
+export const LOGIN_PAGE = '/login';
+export const FORGOT_PASSWORD_PAGE = '/forgot-password';
+export const HOME_PAGE = '/home';
+export const ERROR_PAGE = '/error-page';
+export const NOT_FOUND_PAGE = '/not-found';