Add playing instructions to the readme

README.md

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 # Wii U tower defense homebrew game
 
 I wanted to make a tower defense homebrew game for the Wii U. It uses devKitPro wut and the OSScreen API.
+
+## Playing the game
+
+**Using a Wii U console:** [Install CFW](https://wiiu.hacks.guide), go to the [latest workflow run](https://github.com/MatthewL246/wiiu-tower-defense/actions/workflows/cmake.yml?query=branch%3Amain), download and unzip the build artifact, and copy the `wiiu-tower-defense.rpx` and `wiiu-tower-defense.wuhb` files over to your SD card at `/wiiu/apps/`.
+
+**Using a PC:** [Download the Cemu emulator](https://cemu.info/#download), go to the [latest workflow run](https://github.com/MatthewL246/wiiu-tower-defense/actions/workflows/cmake.yml?query=branch%3Amain), download and unzip the build artifact, and drag and drop the `wiiu-tower-defense.rpx` file onto the Cemu window.