Is it ok to attach a html (only html and css, without js) file containing a short quickstart of the application? I already have a html for other purposes and it fits very well for reviewer to better undestand the application.

I'm developing an application with an underscore ("_") present in the app's name. Let's suppose "tes_t" is the name. In a search containing only "tes", will "test_t" be in the result? Does underscores affect in some way application indexing?