Add Windows support (#555)

* Add Windows support

* Assign eks:kube-proxy-windows group to worker nodes

* Add Instructions for adding Windows Workers at FAQ.md

* Remove unnecessary variables from userdata_windows.tpl

* Update CHANGELOG.md

templates/userdata_windows.tpl

@@ -0,0 +1,11 @@
+<powershell>
+${pre_userdata}
+
+[string]$EKSBinDir = "$env:ProgramFiles\Amazon\EKS"
+[string]$EKSBootstrapScriptName = 'Start-EKSBootstrap.ps1'
+[string]$EKSBootstrapScriptFile = "$EKSBinDir\$EKSBootstrapScriptName"
+& $EKSBootstrapScriptFile -EKSClusterName ${cluster_name} -KubeletExtraArgs '${kubelet_extra_args}' 3>&1 4>&1 5>&1 6>&1
+$LastError = if ($?) { 0 } else { $Error[0].Exception.HResult }
+
+${additional_userdata}
+</powershell>

templates/worker-role.tpl

@@ -3,3 +3,6 @@
       groups:
         - system:bootstrappers
         - system:nodes
+        %{~ if platform == "windows" ~}
+        - eks:kube-proxy-windows
+        %{~ endif ~}