samples: add Terra samples

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

samples/Terra/and.t

@@ -0,0 +1,9 @@
+local test = require("test")
+
+terra foo(a : double, b : double, c : double) : bool
+    return a < b and b < c
+end
+
+test.eq(foo(1,2,3),true)
+test.eq(foo(1,2,1),false)
+test.eq(foo(2,1,2),false)