Initial data commit

Task/Symmetric-difference/PowerShell/symmetric-difference.psh

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+$A = @( "John"
+        "Bob"
+        "Mary"
+        "Serena" )
+
+$B = @( "Jim"
+        "Mary"
+        "John"
+        "Bob" )
+
+#  Full commandlet name and full parameter names
+Compare-Object -ReferenceObject $A -DifferenceObject $B
+
+#  Same commandlet using an alias and positional parameters
+Compare $A $B
+
+#  A - B
+Compare $A $B | Where SideIndicator -eq "<=" | Select -ExpandProperty InputObject
+
+#  B - A
+Compare $A $B | Where SideIndicator -eq "=>" | Select -ExpandProperty InputObject