Add kubectl support

modules/kubectl/README.sh

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+KUBECTL
+===
+
+Add command suggestion for kubectl

modules/kubectl/init.zsh

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+#
+# Add command suggestion for kubectl
+#
+# Authors:
+#   Duy Pham <phamthaibaoduy@live.com>
+#
+
+if (( $+commands[kubectl] )); then
+  source <(kubectl completion zsh)
+fi