Add manifest file for OnlyOFFICE v5.6.0 x64 (#3077)

manifests/ONLYOFFICE/DesktopEditors/5.6.0.yaml

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+Id: ONLYOFFICE.DesktopEditors
+Version: 5.6.0
+MinOSVersion: 10.0.0.0
+Name: Desktop Editors
+Publisher: ONLYOFFICE
+License: AGPL-3.0
+LicenseUrl: https://www.gnu.org/licenses/agpl-3.0.en.html
+AppMoniker: ONLYOFFICE
+Tags: office, word, excel, powerpoint, editor, text editor, document, spreadsheet, presentation
+Description: "Create, view and edit text documents, spreadsheets and presentations of any size and complexity. Work on documents of most popular formats: DOCX, ODT, XLSX, ODS, CSV, PPTX, ODP, etc. Deal with multiple files within one and the same window thanks to the tab-based user interface."
+Homepage: https://www.onlyoffice.com/en/desktop.aspx
+FileExtensions: doc, docx, odt, rtf, txt, pdf, epub, xps, djvu, xls, xlsx, ods, csv, ppt, pptx, odp
+Installers:
+  - Arch: x64
+    Url: https://github.com/ONLYOFFICE/DesktopEditors/releases/download/ONLYOFFICE-DesktopEditors-5.6.0/DesktopEditors_x64.exe
+    Sha256: E0A6703983A353CE7B5205205302B87A4D5FCC982F4B8A708CE143CC4A96823B
+    InstallerType: inno
+    Switches:
+      Silent: "/s /S /q /Q /quiet /silent /SILENT /VERYSILENT"
+      SilentWithProgress: "/s /S /q /Q /quiet /silent /SILENT /VERYSILENT"