How to add new rpm package to local repository server?

In my network I have local repository server.
# zypper lr -d
# | Alias     | Name      | Enabled | GPG Check | Refresh | Priority | Type   | URI                                  | Service
1 | localrepo | localrepo | Yes     | ( p) Yes  | No      |   99     | rpm-md | |
I would like to add to it a new package - in this example: nmap-7.60-1.x86_64.rpm.
I simply copied it to the directory where all other packages of the local repository are kept.
Now, when I try install it with zypper command i get this output:
# zypper install nmap
Loading repository data...
Reading installed packages...
'nmap' not found in package names. Trying capabilities.
No provider of 'nmap' found.
Resolving package dependencies...

Nothing to do.