Add Spring Security to Service Example

All works.
Checked for that test cases:

• for http://localhost:8080/ it is not protected,

• for http://localhost:8080/api/foos/count is available for authenticated users (regular user and admin),

• for http://localhost:8080/weather/Gdynia only admin has access,

• for http://localhost:8080/logout .

For more details see report below.

In order to test this ticket, verify that endpoints:
1. / - Is not protected
2. /api/foos/count - is available for authenticated users
3. /weather/<city_name> - should be accessible by admins only

Credentials:
regular user: user/password,
admin: admin/password
To sign out simply GET /logout