docs: update CONTRIBUTING.md with an example of self-assigning an issue. #13

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	name: Comment Bot

	on:
	issue_comment:
	types:
	- created
	- edited

	jobs:
	issue_assign:
	name: "Assign issue"
	permissions:
	issues: write
	if: github.event.comment.body == 'take'
	runs-on: ubuntu-latest
	steps:
	- uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
	with:
	github-token: ${{ secrets.GITHUB_TOKEN }}
	script: \|
	github.rest.issues.addAssignees({
	owner: context.repo.owner,
	repo: context.repo.repo,
	issue_number: context.payload.issue.number,
	assignees: context.payload.comment.user.login
	});

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