Added installation instructions of rpm
Added installation instructions of rpm

kompose is packaged for CentOS and Fedora, so added easy installation
instructions.

ngtuna/kompose,cdrage/kompose,sebgoa/kompose,ashetty1/kompose,ngtuna/kompose,surajnarwade/kompose,procrypt/kompose,procrypt/kompose,ashetty1/kompose,skippbox/kompose,procrypt/kompose,ashetty1/kompose,containscafeine/kompose,kubernetes/kompose,kadel/kompose,rupalibehera/kompose,surajnarwade/kompose,gitlawr/kompose,rupalibehera/kompose,cab105/kompose,sebgoa/kompose,containscafeine/kompose,surajnarwade/kompose,kadel/kompose,skippbox/kompose,cab105/kompose,cdrage/kompose,gitlawr/kompose,containscafeine/kompose,kubernetes/kompose,rupalibehera/kompose,ngtuna/kompose,skippbox/kompose,gitlawr/kompose,sebgoa/kompose,cab105/kompose