samples: add Terra samples

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

samples/Terra/testlang1.t

@@ -0,0 +1,21 @@
+import "lib/testlang"
+
+print("hello")
+local a = image "astring"
+image 4
+image and,or,&
+image image
+image akeyword
+image foobar
+print(a)
+image bar 3
+print(bar,bar1)
+
+local image what 4 3
+print(what)
+local a = 4
+local b = 5
+c = 6
+print(foolist { a, b, c})
+--test eos token
+image