Add Nimbella plugin

[satyarohith]

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Are you adding a plugin or updating one?

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• Updating a plugin

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• Read and followed the plugin author guidelines.
• Included all required fields in your entry.
• Tested the plugin locally and on Netlify, using the plugin version stated in your entry.

Test plan
https://app.netlify.com/sites/cranky-mcnulty-5ab308/deploys/5f7510ed12c3482dd2bbf317

[netlify-bot]

Added Packages

• https://registry.npmjs.org/netlify-plugin-nimbella/-/netlify-plugin-nimbella-1.7.0.tgz

[erezrokah]

Thanks @satyarohith, very cool plugin.
I followed up with some issues+PRs on the repo, please let me know what you think

[satyarohith]

Thanks a lot for your contributions, @erezrokah! We fixed most of the issues and made a new release. Let me know what you think. :)