adding contribute.md

Signed-off-by: Mano Marks <mano.marks@gmail.com>

contribute.md

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+hank you so much for your interest in contributing to [Docker](https://docker.com) tutorials. Docker has open source in its DNA, and has always worked closely with the community.
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+Just a few quick things to be aware of before you get started.
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+This is a repository for tutorials that use Docker based projects as much as possible. So if there’s a Docker tool for what you’re describing, please use that.
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+Anything you contribute will be under an Apache license. Docker will choose which tutorials to accept and reject, and will be able to take any tutorials here and put them in Docker documentation. Likewise, anything posted here may be forked by anyone on GitHub.
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+We will be following the a lightweight version of the Docker contribution policies and procedures as explained in [the documentation](https://docs.docker.com), and the [Docker engine repo](https://github.com/docker/docker/blob/master/CONTRIBUTING.md). This largely boils down to [signing your PRs](https://github.com/docker/docker/blob/master/CONTRIBUTING.md#sign-your-work), and following the community guidelines.