move shell scripts and zsh and add fav vscode themes

shell/shell_scripts/lessons/real_numbers.sh

@@ -0,0 +1,26 @@
+#! /bin/bash
+
+
+a=0
+b=0
+number_of_args=$#
+
+#
+# First see the sufficient cmd args
+#
+if [ $# -lt 2 ] ; then
+   echo -e "Opps! I need atleast 2 command line args\n"
+   echo -e "Syntax: $0: number1 number2 ... numberN\n"
+   echo -e "Example:$0 5 4\n\t$0 56 66 34"
+   exit 1
+fi
+
+#
+# now calculate the average of numbers given on command line as cmd args
+#
+
+a=$1
+b=$2
+
+c=`echo $a + $b | bc`
+echo "$a + $b = $c"