samples: add Terra samples

source: https://github.com/zdevito/terra/tree/master/tests

samples/Terra/symparam3.t

@@ -0,0 +1,15 @@
+
+local a = symbol(int)
+local c = {}
+terra foo([a], b : int, [c])
+	return [a] + b
+end
+local d = {symbol(int),symbol(int)}
+terra foo2([a], b : int, [d])
+	return [a] + b + [d[1]] + [d[2]]
+end
+
+local test = require("test")
+
+test.eq(foo2(1,2,3,4),10)
+test.eq(foo(1,2),3)