Add "remind" plugin

Show reminders using the remind(1) tool on shell startup, but not more
often than once every hour.

diff --git a/plugins/remind/README.md b/plugins/remind/README.md
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+## remind
+
+Show reminders using the remind(1) tool on shell startup, but not more often
+than once every hour.
+
+### Command Aliases
+
+- `remindcal`: show a TUI calender for the upcoming weeks.

diff --git a/plugins/remind/remind.zshrc b/plugins/remind/remind.zshrc
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+# AX-ZSH: Alex' Modular ZSH Configuration
+# remind.zshrc: Show reminders of remind(1).
+
+# Make sure that "remind(1)" is installed.
+(( $+commands[remind] )) || return 1
+
+# Some handy alias.
+alias remindcal='remind -ccu+3 -m -w$COLUMNS,4,0 $HOME/.remind'
+
+# Check if reminders have been shown during last 60 minutes, and if so,
+# don't show them now but return.
+[[ -z `find ~/.last_reminder -mmin -60 2>/dev/null` ]] || return 0
+
+# Show reminders now.
+remind -h -g -t5 ~/.remind && echo
+
+# Wtite "stamp" file.
+[[ -w ~/ ]] && touch ~/.last_reminder