Add Go 1.15.7 (#6596)

manifests/Golang/Go/1.15.7.yaml

@@ -0,0 +1,15 @@
+Id: GoLang.Go
+Version: 1.15.7
+Name: Go
+Publisher: Golang
+License: Copyright (c) 2009 The Go Authors
+LicenseUrl: https://github.com/golang/go/blob/go1.15.7/LICENSE
+AppMoniker: go
+Tags: go, golang, go1.15, golang1.15
+Description: Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
+Homepage: https://golang.org
+Installers:
+  - Arch: x64
+    Url: https://golang.org/dl/go1.15.7.windows-amd64.msi
+    Sha256: 548e73797f07c8f7dcd4e419f396a41702ab68d1bc82ff637587b94bcdc9a462
+    InstallerType: msi