Update TrashCat repo with the latest version from Unity Asset Store

[iulianatodoran]

Tasks

• [x] Download the latest version from https://assetstore.unity.com/packages/templates/tutorials/endless-runner-sample-game-87901
• [x] In PlayerData.cs change tutorialDone to be true always in order to be able to generate builds for TrashCat without starting with the tutorial
• [x] Update the project with the downloaded version and changed script (see above) and push changes to master branch
• [x] Update the AltTester Unity SDK submodule
• [x] Create README.md with relevant information

[iulianatodoran]

@sandraaltom as agreed I will assign no release label, but I'll be working on the ticket ftm