license under MIT

LICENSE (MIT), installed as /usr/share/doc/terraria-server-manager/copyright
in both packages and with %license in the RPM. README gains a License
section and an up-to-date repository layout and build section.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packaging/rpm/terraria-server-manager.spec.in

@@ -4,12 +4,14 @@
 # package can be built anywhere rpmbuild runs (the release workflow builds it on
 # Ubuntu). They do what packaging/deb/ does for Debian; see the comments there.
 
+# The license goes in /usr/share/licenses/<name>, as on Fedora, wherever it's built
+%global _docdir_fmt %{name}
+
 Name:           terraria-server-manager
 Version:        @VERSION@
 Release:        1
 Summary:        Run multiple Terraria and tModLoader dedicated servers with systemd
-# TODO: no license has been chosen for this project yet
-License:        LicenseRef-Unspecified
+License:        MIT
 URL:            https://gitea.adbraun.lol/adam/terraria-server-manager
 Packager:       Adam Brown <adam@adbraun.lol>
 Source0:        %{name}-%{version}.tar.gz
@@ -106,6 +108,7 @@ if [ -d /run/systemd/system ]; then
 fi
 
 %files
+%license LICENSE
 /usr/bin/terractl
 /usr/lib/terraria-server-manager/
 /usr/lib/systemd/system/terraria@.service