Add a couple of questions

exercises/shell/factors.md

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+## Shell Scripting - Factors
+
+### Objectives
+
+Write a script that when given a number, will:
+
+* Check if the number has 2 as factor, if yes it will print "one factor"
+* Check if the number has 3 as factor, if yes it will print "one factor...actually two!"
+* If none of them (2 and 3) is a factor, print the number itself