How to create a simple rpm using spec file just to deploy few files as they are in source in Red Hat Enterprise Linux 5/6/7?

Issue

• There are few files in a tar compressed archive, just need to create an rpm and deploy them using the same.
• Here is the tar archive tree structure.

[root@localhost ~]# tar tvf someapp.tar.gz
-rw-r--r-- root/root         0 2014-06-18 08:49 /etc/someapp.cfg
-rw-r--r-- root/root         0 2014-06-18 08:48 /opt/someapp/file1
-rw-r--r-- root/root         0 2014-06-18 08:48 /opt/someapp/file2
-rw-r--r-- root/root         0 2014-06-18 08:48 /opt/someapp/file3
-rw-r--r-- root/root         0 2014-06-18 08:48 /opt/someapp/file4

• The rpm shall delete existing /etc/someapp.cfg.save and rename /etc/someapp.cfg to /etc/someapp.cfg.save and then deploy /etc/someapp.cfg from rpm.
• It shall also display /etc/someapp.cfg as a configuration file.
• The owner and group of all files shall be root with default permissions.