Add manifest file for 7Zip v20.0.0 alpha 2 (#3044)

* Add manfiest file for Joplin v1.0.233

* Add manifest file for 7Zip v20.0 alpha 2

* Delete 1.0.233.yaml

manifests/7Zip/7Zip/20.0.0-alpha-2.yaml

@@ -0,0 +1,20 @@
+Id: 7zip.7zip
+Name: 7Zip
+AppMoniker: 7zip
+Version: 20.0.0-alpha-2
+Publisher: 7zip
+Author: 7zip
+License: Copyright (C) 1999-2020 Igor Pavlov. - GNU LGPL
+LicenseUrl: https://7-zip.org/license.txt
+MinOSVersion: 10.0.0.0
+Homepage: https://www.7-zip.org/
+Description: Free and open source file archiver with a high compression ratio.
+Tags: "7zip,compression,file compression,utility,tool,zip"
+InstallerType: exe
+Installers: 
+  - Arch: x64 
+    Url: https://7-zip.org/a/7z2002-x64.exe
+    Sha256: 356E128FCE6625F5BBE03D4B8B6DFCD744EE4482A16E9E495EE44AD77C2435E5
+    Switches:
+      Silent: /S
+      SilentWithProgress: /S