Add link to writers page

README.md

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+# Write for GitLab
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 This project is for managing the proposal, assignment and writing of blog posts. 
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+Find out more about how you can [Write for GitLab](https://about.gitlab.com/community/writers/).
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 The posts themselves are published in the [Gitlab.com project](https://gitlab.com/gitlab-com/www-gitlab-com)
-There the blog posts are drafted, commented on and merged. 
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+There the blog posts are drafted, commented on and merged.