Add plugin for dynamic switch iTerm2 theme

I want to dynamically change the theme in iterm2 depending on the time
of day

plugins/iterm2-dynamic-theme/Readme.md

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+##
+
+**Maintainer:** [@idoo](https://github.com/idoo)
+
+This plugin switch iTerm2 theme depends on the time of day
+
+### Usage
+
+Please create two profile with name `dark` and `light`
+

plugins/iterm2-dynamic-theme/iterm2-dynamic-theme.plugin.zsh

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+function set_iterm_profile() {
+  echo -e "\033]50;SetProfile=$1\a"
+}
+
+function start_dynamic_theme() {
+  HOUR=`date +%H`
+  if [ $HOUR -ge 8 -a $HOUR -le 17 ]; then
+    set_iterm_profile light
+  else
+    set_iterm_profile dark
+  fi
+}
+
+start_dynamic_theme &!
+
+while true
+do
+  start_dynamic_theme
+  sleep 600
+done