How to add new contract type to Realia Real Estate WordPress Plugin

How to add new contract type to Realia

1. Go to wp-content/plugins/realia/realia.php
2. Defines new constastant after "define( 'REALIA_CONTRACT_RENT', 'RENT' );" line 56
3. I choose to add a vacancy rent option : "define( 'REALIA_CONTRACT_VACANCY', 'VACANCY' );"
4. Then go to wp-content/plugins/realia/include/post-types/class-realia-post-type-property.php
5. In line 81 add your constant with string for the front-end.
6. Finally for the display go to wp-content/plugins/realia/templates/widget/filter-fields/contract.php
7. Add your constant like REALIA_CONTRACT_RENT
8. Done.