Added comma operator example

Author: Undalevein

squirrel/comma_operator.nut

@@ -0,0 +1,6 @@
+local a, b, x
+x = a = 5, b = 9, a * a + b * b
+
+print(a + "\n")
+print(b + "\n")
+print(x + "\n")

squirrel/test.ps1

@@ -18,6 +18,7 @@ sq "$PSScriptRoot\clockhands_time.nut" |
 sq "$PSScriptRoot\clockhands.nut" |
     Compare-Object (Get-Content "$PSScriptRoot\..\test\clockhands_expected") |
     Assert-MatchTests &&
+sq "$PSScriptRoot\comma_operator.nut" &&
 sq "$PSScriptRoot\debug_keywords.nut" &&
 sq "$PSScriptRoot\floating_point_mystery.nut" &&
 sq "$PSScriptRoot\hello.nut" &&