Add image for "Social Preview"

[jglaszka]

Social preview image is image what shows up when someone shares link to the repo. We can customize it to have a nice look.

Note: Image should be at least 640×320px (1280×640px for best display).

[StephCurry07]

Okay so what I understood is the social preview that's shown currently, we need to modify it to look better and whatever be the modification we have the constraint of picture quality too. Am I correct? If yes, then can we change the image or we just have to modify it in any way... I'm looking forward to work on this issue.

[jglaszka]

Yes, the task is to design a social preview graphic. We would like to change it to suggest that our library is related to internationalization/languages. But, to be honest, we want to save this task only for the maintainers of tradukisto, because we are concerned about copyrights if someone else will do that. So it is not available to assign for external maintainers.