Add missing nimscript test.

tests/nimscript/nimscript.nim

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+echo("Hello World")

tests/nimscript/nimscript.nimble

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+# Package
+
+version       = "0.1.0"
+author        = "Dominik Picheta"
+description   = "Test package"
+license       = "BSD"
+
+bin = @["nimscript"]
+
+# Dependencies
+
+requires "nim >= 0.12.1"
+
+task test, "test description":
+  echo(5+5)
+
+task example, "Build and run examples for current platform":
+    setCommand "c"