How to add fields in wp-option table in wordpress?

Inside a function or any where add below code :

add_option(‘new_field_name’,’value’);

eg:
add_option(‘bonus_points_for_price’,’1′);

Getting value from this field:

$bonus_points_price_value=get_option(‘bonus_points_for_price’);

Delete the created field:

delete_option(‘bonus_points_for_price’);