Set sensible icons for ADA development

### Problem Right now, specific file extensions for ADA development lack of a proper Nerd Font icon and consistent colors. As you can see below:   ### Requirement Add a set of icons for the specific extensions (i.e. `.ads`, `adb`, and `.gpr`). Make colors consistent with the ones present on C language (i.e. `.h`, `.c`, and `Makefile`). So changing between C/CPP projects and ADA projects (both compiled with gcc), shows consistent palette of colors.