samples: add Terra samples

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

samples/Terra/anon.t

@@ -0,0 +1,26 @@
+local test = require("test")
+
+local Num = int
+
+local fib =
+terra(a : Num) : Num
+    var i,c,p = 0,1,1
+    while i < a do
+        c,p = c + p,c
+        i = i + 1
+    end
+    return c
+end
+
+function fib2(a) 
+    local i,c,p = 0,1,1
+    while i < a do
+        c,p = c + p,c
+        i = i + 1
+    end
+    return c
+end
+for i = 0,10 do
+    print(fib(i))
+    test.eq(fib(i),fib2(i))
+end