samples: add Terra samples

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

samples/Terra/cnames.t

@@ -0,0 +1,25 @@
+struct Foo {
+    c : float;
+}
+Foo.displayname = "struct.Foo"
+terra useFoo()
+    var a : Foo
+    a.c = 4.5
+    return a.c
+end
+assert(4.5 == useFoo())
+
+C = terralib.includecstring [[
+typedef struct { int a; int b; } Foo;
+]]
+
+terra stuff()
+    var a : Foo
+    var b : C.Foo
+    b.a = 1
+    b.b = 2
+    a.c = 4.5
+    return b.a + b.b + a.c
+end
+
+assert(7.5 == stuff())