Adding button to insert video link to "Create Topic Page"

[vsolskyyy]

Adding a button to the "Create Topic Page" labelled "Video Link" with a video icon that allows users to insert a video url and have the video play directly on the nodeBB website. Fixes Issue: #16

I edited node_modules/nodebb-plugin-markdown/public/js/markdown.js to add a button to the markdown that asks for a video-url and when the user puts in the url, the video can play on the topic.

I edited node_modules/nodebb-plugin-markdown/index.js to include this new button I created after the image-link button, assigning a video icon to the button and labelling it "Video Link"

[coveralls]

Pull Request Test Coverage Report for Build 11021928627

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 82.671%

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Totals
Change from base Build 10982176047:	0.0%
Covered Lines:	22323
Relevant Lines:	25582

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💛 - Coveralls