samples: add Terra samples

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

samples/Terra/logical.t

@@ -0,0 +1,33 @@
+
+
+local T = true
+local F = false
+
+terra check()
+    var a = true
+    return not true == false
+end
+
+assert(check() == true)
+
+terra check2()
+    return not T == F
+end
+
+assert(check2() == true)
+
+terra check3()
+    return not T ==  not not T
+end
+
+assert(check3() == false)
+
+terra check4()
+    return not not T == T and not not F == F and true == T and false == F 
+end
+
+assert(check4() == true)
+
+terra foo() return not false end
+ 
+assert(foo() == true)