add plugin tt

plugins/tt/README.MD

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+# TT 
+
+This plugin provides mutual conversion of timestamp and date. 
+
+To use it add tt to the plugins array in your zshrc file.
+
+```bash
+plugins=(... tt)
+```
+# Example
+
+print timestamp for "2019-10-16"
+```bash
+tt 2019-10-16
+```
+
+print timestamp for "2019-10-16 18:41:00"
+```bash
+tt "2019-10-16 18:41:00"
+```
+
+print date for "1571222561"
+```bash
+tt 1571222561
+```
+echo 2019-10-16 18:42:41

plugins/tt/tt.plugin.zsh

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+# 
+# Functions
+#
+# timestamp to date Or date to timestamp
+#
+tt () {
+	if [[ $1 =~ "-" ]]
+	then
+		if [[ $1 =~ " " ]]
+		then
+			date -j -f "%Y-%m-%d %H:%M:%S" "$1" +%s 2> /dev/null
+		else
+			date -j -f "%Y-%m-%d %H:%M:%S" "$1 00:00:00" +%s 2> /dev/null
+		fi
+	elif [[ $1 = "" ]]
+	then
+		date +%s
+	else
+		date -r $1 "+%Y-%m-%d %H:%M:%S"
+	fi
+}