When I start a personal project I create a readme file that has a ToDo section and a Change Log section. Anything I think of that I might want to do I put under ToDo, break it into small chunks and prioritize it. When a task is completed under the ToDo section, I move it to the Change Log section. Easy to maintain, track progress, and documents both a Road Map and Changes all in one place. It also has a section for references to shared assets that need attribution. Actually to keep it simple the same document usually also has an about section, an installation section, and a usage section.