Add go.mod, and vendor wincred v1.0.0

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

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

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+*.go text eol=lf

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

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+# 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

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+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