Added Gow version 0.8.0 (#13412)

* Added Gow version 0.8.0

* Fix the file extension from yml to yaml

manifests/b/bmatzelle/Gow/0.8.0/bmatzelle.Gow.yaml

@@ -0,0 +1,19 @@
+PackageIdentifier: bmatzelle.Gow
+PackageName: Gow
+Publisher: bmatzelle
+PackageVersion: 0.8.0
+License: Copyright (c) 2006-2010 Brent Matzelle
+LicenseUrl: https://github.com/bmatzelle/gow/blob/master/licenses/Gow-License.txt
+ShortDescription: Gow (Gnu On Windows) is the lightweight alternative to Cygwin.
+PackageUrl: https://github.com/bmatzelle/gow
+InstallerSwitches:
+  Silent: /S
+  SilentWithProgress: /S
+Installers:
+  - Architecture: x64
+    InstallerType: exe
+    InstallerUrl: https://github.com/bmatzelle/gow/releases/download/v0.8.0/Gow-0.8.0.exe
+    InstallerSha256: 9B06E0F9471D61D1019BF4D133C0ED23A4CCEE27B6B8758A922D681469B82E42
+PackageLocale: en-US
+ManifestType: singleton
+ManifestVersion: 1.0.0