Add go.mod, and vendor wincred v1.0.0

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

go.mod

@@ -0,0 +1,8 @@
+module github.com/docker/docker-credential-helpers
+
+go 1.13
+
+require (
+	github.com/danieljoos/wincred v1.0.0
+	github.com/stretchr/testify v1.7.0 // indirect
+)

go.sum

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+github.com/danieljoos/wincred v1.0.0 h1:JKQJ2Ek8EcovCUNlUTvLjXMw1onuHm3eMKSF8SEO8SI=
+github.com/danieljoos/wincred v1.0.0/go.mod h1:SnuYRW9lp1oJrZX/dXJqr0cPK5gYXqx3EJbmjhLdK9U=
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

vendor/github.com/danieljoos/wincred/.gitattributes

@@ -0,0 +1 @@
+*.go text eol=lf

vendor/github.com/danieljoos/wincred/.gitignore

@@ -0,0 +1,23 @@
+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test

vendor/github.com/danieljoos/wincred/README.md

@@ -0,0 +1,98 @@
+wincred
+=======
+
+Go wrapper around the Windows Credential Manager API functions.
+
+[![Build status](https://ci.appveyor.com/api/projects/status/eclecjwniu2n4u3w/branch/master?svg=true)](https://ci.appveyor.com/project/danieljoos/wincred/branch/master)
+[![GoDoc](https://godoc.org/github.com/danieljoos/wincred?status.svg)](https://godoc.org/github.com/danieljoos/wincred)
+
+
+Installation
+------------
+
+```Go
+go get github.com/danieljoos/wincred
+```
+
+
+Usage
+-----
+
+See the following examples:
+
+### Create and store a new generic credential object
+```Go
+package main
+
+import (
+    "fmt"
+    "github.com/danieljoos/wincred"
+)
+
+func main() {
+    cred := wincred.NewGenericCredential("myGoApplication")
+    cred.CredentialBlob = []byte("my secret")
+    err := cred.Write()
+    
+    if err != nil {
+        fmt.Println(err)
+    }
+} 
+```
+
+### Retrieve a credential object
+```Go
+package main
+
+import (
+    "fmt"
+    "github.com/danieljoos/wincred"
+)
+
+func main() {
+    cred, err := wincred.GetGenericCredential("myGoApplication")
+    if err == nil {
+        fmt.Println(string(cred.CredentialBlob))
+    }
+} 
+```
+
+### Remove a credential object
+```Go
+package main
+
+import (
+    "fmt"
+    "github.com/danieljoos/wincred"
+)
+
+func main() {
+    cred, err := wincred.GetGenericCredential("myGoApplication")
+    if err != nil {
+        fmt.Println(err)
+        return
+    }
+    cred.Delete()
+} 
+```
+
+### List all available credentials
+```Go
+package main
+
+import (
+    "fmt"
+    "github.com/danieljoos/wincred"
+)
+
+func main() {
+    creds, err := wincred.List()
+    if err != nil {
+        fmt.Println(err)
+        return
+    }
+    for i := range(creds) {
+        fmt.Println(creds[i].TargetName)
+    }
+}
+```

vendor/github.com/danieljoos/wincred/appveyor.yml

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+version: '{build}'
+clone_folder: c:\gopath\src\github.com\danieljoos\wincred
+environment:
+  GOPATH: c:\gopath
+install:
+- cmd: >-
+    rmdir c:\go /s /q
+
+    appveyor DownloadFile https://storage.googleapis.com/golang/go1.6.1.windows-amd64.msi
+
+    msiexec /i go1.6.1.windows-amd64.msi /q
+
+    go version
+
+    go env
+
+    go get -t
+build_script:
+- cmd: go install
+test_script:
+- cmd: >-
+    cd %GOPATH%/src/github.com/danieljoos/wincred
+
+    go test -v -cover

vendor/modules.txt

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+# github.com/danieljoos/wincred v1.0.0
+github.com/danieljoos/wincred