Missing license info

[IonescuB]

It is unclear under which OSS license terms is tekari distributed? Could you please clarify? Thank you!

[wjakob]

@IonescuB -- the BSD 3-clause license (

tekari/src/help_window.cpp

Line 178 in 3fc9cb4

add_text(about, "It is released under the BSD 3 - Clause License.");

).

@4str0m -- would you mind adding a "LICENSE" file to the project root directory so that GitHub detects this automatically? Thanks!