ranger-cd plugin added

plugins/ranger-cd/README.md

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+## ranger-cd
+
+Compatible with ranger 1.4.2 through 1.7.\*
+
+After ranger quits, automatically change the current directory of zsh to the
+last visited directory in ranger.
+
+Code comes from a [ranger plugin](https://github.com/ranger/ranger/blob/master/examples/bash_automatic_cd.sh)
+for bash, but I find it more convenient to have it as an [oh-my-zsh](https://github.com/robbyrussell/oh-my-zsh/) plugin.

plugins/ranger-cd/ranger-cd.plugin.zsh

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+# functions
+function ranger-cd {
+  tempfile="$(mktemp -t tmp.XXXXXX)"
+  /usr/bin/ranger --choosedir="$tempfile" "${@:-$(pwd)}"
+  test -f "$tempfile" &&
+    if [ "$(cat -- "$tempfile")" != "$(echo -n `pwd`)" ]; then
+        cd -- "$(cat "$tempfile")"
+    fi
+  rm -f -- "$tempfile"
+}
+
+# aliases
+alias ranger=ranger-cd