Add all the A tasks

Task/Add-a-variable-to-a-class-instance-at-runtime/CoffeeScript/add-a-variable-to-a-class-instance-at-runtime.coffee

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+# CoffeeScript is dynamic, just like the Javascript it compiles to.
+# You can dynamically add attributes to objects.
+
+# First create an object very simply.
+e = {}
+e.foo = "bar"
+e.yo = -> "baz"
+console.log e.foo, e.yo()
+
+# CS also has class syntax to instantiate objects, the details of which
+# aren't shown here.  The mechanism to add members is the same, though.
+class Empty
+  # empty class
+
+e = new Empty()
+e.foo = "bar"
+e.yo = -> "baz"
+console.log e.foo, e.yo()