The Charge SRD is released under Creative Commons Attribution CC-BY.
That means you are free to use the content of this SRD for your own game, provided you give proper credit.
Because Charge is based off Blades in the Dark, you would also need to credit the creators of this game as well.
To do so, copy the text below in your game, and things should be good to go.
This work is based on Charge, product of Fari RPGs (https://farirpgs.com/), developed and authored by René-Pier Deshaies-Gélinas , and licensed for our use under the Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/)
This work is also based on Blades in the Dark (found at http://www.bladesinthedark.com/), product of One Seven Design, developed and authored by John Harper, and licensed for our use under the Creative Commons Attribution 3.0 Unported license (http://creativecommons.org/licenses/by/3.0/).
Powered By Charge
If you want, you can also include the following images in your game to say that it's powered by Charge.