samples: add Terra samples

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

samples/Terra/testlog.t

@@ -0,0 +1,8 @@
+terra foo(a : bool, b : bool, c : bool) return a and b or c end
+
+foo:disas()
+terra callfoo()
+    var r = foo(true,false,true)
+    return r
+end
+assert(callfoo())