TinyMCE – How to add plugin?

I am trying to create multilingual website that contain both directional text, i.e. Right to left & Left to Right. Now I want to add button that will wrap LTR text in to <bdo dir=”ltr”></bdo> tag.

To do that I had found a TinyMCE plugin here. But question is that how to add this in wordpress? Please help me.

Thanks