As described in the Readme, I think the next steps would be having the language added in Pontoon, so that you can begin translating the user interface; and beginning to collect sentences in the Sentence collector. As members of your community begin writing, they could consider licensing their writings as CC-0 when possible and contributing them to the sentence collector.
You might also consider setting up a Wikipedia. A few sentences can be collected from Wikipedia for use in this project, although the Wikipedia license is generally not compatible.
This is just a list of ISO 639-3 language codes, each paired with a script name. Although it is not on this list, Burushaski does have a 639-3 code: bsk (see [here](http://www.endangeredlanguages.com/lang/1614 for example), and the script proposed in the Burushaski Language Documentation Project is Latin (the code “Latn” is used in nukeador’s list). It looks like the script is composed of the ASCII letters, plus vowels with macron (āīēōū), including some digraphs and trigraphs. @amjadsaleem is this the script your community is using?