Move all scripts to 'src' directory

src/stopwatch.sh

@@ -0,0 +1,13 @@
+#!/bin/sh 
+# Simple stopwatch script that simply counts the elapsed time in seconds. 
+
+start=$(date +%s)
+
+stty -echo  # hide keyboard input 
+
+while [ true ]
+do
+    time="$(($(date +%s) - $start))"
+    printf '%s\r' "$(date -u -d "@$time" +%H:%M:%S)"
+    sleep 1s
+done