samples: add Terra samples

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

samples/Terra/lvaluequote.t

@@ -0,0 +1,22 @@
+
+
+checkl = macro(function(a)
+	assert(a:islvalue())
+	return a
+end)
+
+checkr = macro(function(a)
+	assert(not a:islvalue())
+	return a
+end)
+
+
+terra testit()
+
+	var a = checkr(4)
+	var b = checkr(checkl(a) + 3)
+	var c = checkl([quote var d = 5 in d end])
+	return a + b + c
+end
+
+assert(4+7+5 == testit())