Add KeePassXC (microsoft#938)

Co-authored-by: DocBox <[email protected]>

manifests/KeePassXCTeam/KeePassXC/2.5.4.yaml

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+Id: KeePassXCTeam.KeePassXC
+Name: KeePassXC
+Publisher: KeePassXC Team
+Version: 2.5.4
+MinOSVersion: 10.0.0.0
+License: Copyright (C) 2016-2020 KeePassXC Team
+LicenseUrl: https://github.com/keepassxreboot/keepassxc/blob/develop/COPYING
+AppMoniker: keepassxc
+Homepage: https://keepassxc.org/
+Description: KeePassXC is a community fork of KeePassX, a native cross-platform port of KeePass Password Safe, with the goal to extend and improve it with new features and bugfixes to provide a feature-rich, fully cross-platform and modern open-source password manager.
+Tags: "password, password save, credentials, protect, password manager, security"
+InstallerType: msi
+Installers:
+  - Arch: x64
+    Url: https://github.com/keepassxreboot/keepassxc/releases/download/2.5.4/KeePassXC-2.5.4-Win64.msi
+    Sha256: 01bf1b593efc4a9b92e0ca7148414f6d4f0e63521aefa64d1f8caa0327d35e91