Add appveyor build badge

+ update notes on appveyor acount location

Author: matthewmcnew

README.md

@@ -1,4 +1,4 @@
-# pack - Buildpack CLI [![Build Status](https://travis-ci.org/buildpack/pack.svg?branch=master)](https://travis-ci.org/buildpack/pack)
+# pack - Buildpack CLI [![Travis Build Status](https://travis-ci.org/buildpack/pack.svg?branch=master)](https://travis-ci.org/buildpack/pack) [![Windows Build status](https://ci.appveyor.com/api/projects/status/0dspvks46snrda2v?svg=true)](https://ci.appveyor.com/project/buildpack/pack)
 
 **`pack`** makes it easy for
 - **application developers** to use [buildpacks](https://buildpacks.io/) to convert code into runnable images

appveyor.yml

@@ -12,9 +12,9 @@ environment:
   DOCKER_CERT_PATH: '%APPVEYOR_BUILD_FOLDER%\.travis'
   DOCKER_TLS_VERIFY: '1'
   DOCKER_HOST:
-    secure: 9/n4Ey6XCzZt2TT5VP5cX5sugiR0WWV4bS6W3jo56M4= # currently in jchesterpivotal
+    secure: 9/n4Ey6XCzZt2TT5VP5cX5sugiR0WWV4bS6W3jo56M4= # currently in buildpack account
   file_secret:
-    secure: nyH/ayJ9cnxXI05Vyri7ntns95Sqn/Q9+jGIrVAzZHU= # currently in jchesterpivotal
+    secure: nyH/ayJ9cnxXI05Vyri7ntns95Sqn/Q9+jGIrVAzZHU= # currently in buildpack account
 
 artifacts:
   - path: artifacts