Setup develop branch

[yoshikinoko]

This is just an idea. But I'm always afraid to create PR for the master branch.

According to A successful Git branching model, the master branch should point out the latest release.

We consider origin/master to be the main branch where the source code of HEAD always reflects a production-ready state.

Expected Behaviour

Keep the master branch as same as the latest release on npm.
and use the develop branch for future release

Actual Behaviour

xdpm does not have develop branch

Reproduce Scenario (including but not limited to)

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Steps to Reproduce

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Platform and Version

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Sample Code that illustrates the problem

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Logs taken while reproducing problem

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