Add screenshots and save files for Sonic Forces (#72)

* Add screenshots and save file for Sonic Forces (canary 1906)

* Add save file before final boss

games/sonic-forces/savefiles/before-final-boss.dat

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+title = "Before Final Boss"
+description = "A save file that puts you before the final boss. The avatar is set to the bird species with the drill wispon. Save may require the game to be updated to 1.1.0 along with the free DLC."
+author = "M&M"
+title_id = "01001270012B6000"

games/sonic-forces/savefiles/past-avatar-creation.dat

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+title = "Past Avatar Creation"
+description = "A save file past the avatar creation, starting at Space Port with the avatar being set to bird. Save may require the game to be updated to 1.1.0 along with the free DLC."
+author = "M&M"
+title_id = "01001270012B6000"