Add tasks for all the new languages

Task/Null-object/FreeBASIC/null-object.freebasic

@@ -0,0 +1,20 @@
+'FB 1.05.0 Win64
+
+' FreeBASIC does not have a NULL keyword but it's possible to create one using a macro
+
+#Define NULL CPtr(Any Ptr, 0) '' Any Ptr is implicitly convertible to pointers of other types
+
+Type Dog
+  name As String
+  age As Integer
+End Type
+
+Dim d As Dog Ptr = New Dog
+d->Name = "Rover"
+d->Age = 5
+Print d->Name, d->Age
+Delete d
+d = NULL '' guard against 'd' being used accidentally in future
+
+' in practice many FB developers would simply have written: d = 0 above
+Sleep