Adding stale bot GitHub action

# Stale bot Warns and then closes issues and PRs that have had no activity for a specified amount of time.

## How it works
- After a period of inactivity, a label will be applied to mark an issue as stale, and optionally a comment will be posted to notify contributors that the Issue or Pull Request will be closed.

- If the Issue or Pull Request is updated, or anyone comments, then the stale label is removed and nothing further is done until it becomes stale again.

- If no more activity occurs, the Issue or Pull Request will be automatically closed with an optional comment.

Will be helpful to manage the workflow later on.
I want to work on this

Start by reviewing the repository’s GitHub Actions setup and the stale bot action’s configuration options. The work is complete when inactive issues and pull requests receive the intended warning and are later closed according to the chosen timing and comments.

Written by the indexing model from the issue text.