Create a separate file to all the completed OLD tasks

[tu2-atmanand]

Some user want to have a log of the old completed tasks. So, your main tasks.json file will contain the latest 50 tasks or so. All the older tasks can be put into a json file or in an MD file to keep the formatting.
Or better idea will be in a separate json file and a new window(Modal) to go through the old tasks.

Also keep an option whether to store the older tasks or delete them permanently.