Add FreeCiv 2.6.4 (#10029)

Co-authored-by: chausner <chausner@users.noreply.github.com>

manifests/f/FreeCiv/FreeCiv/2.6.4/FreeCiv.FreeCiv.yaml

@@ -0,0 +1,21 @@
+PackageIdentifier: FreeCiv.FreeCiv
+PackageVersion: 2.6.4
+PackageName: FreeCiv
+Publisher: The FreeCiv Project
+License: GPL
+Tags:
+- civilization
+- game
+- strategy
+- turn-based
+- building
+ShortDescription: Freeciv is a Free and Open Source empire-building strategy game inspired by the history of human civilization.
+PackageUrl: http://www.freeciv.org
+Installers:
+- Architecture: x86
+  InstallerUrl: https://sourceforge.net/projects/freeciv/files/Freeciv%202.6/2.6.4/Freeciv-2.6.4-win32-gtk3-setup.exe/download
+  InstallerSha256: AF4792C9E21C08C0E2E21CE356088F04A37C437D715D9A70F8D922EA082025D6
+  InstallerType: nullsoft
+PackageLocale: en-US
+ManifestType: singleton
+ManifestVersion: 1.0.0