added readme

README.md

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+# Installation
+
+1. Clone this repository into Stardew Valley's game directory.
+
+   - Right click on Stardew Valley in your Steam library.
+   - Manage > Browse local files.
+
+2. Name the cloned directory `Mods`.
+
+   - Steam Deck/Linux users can use this command to clone the repository:
+
+   ```sh
+   git clone https://git.vomitblood.com/Vomitblood/stardew-valley-mods.git Mods
+   ```
+
+   - Stardew Valley game directory should look like this:
+     ![screenshot](assets/screenshot.png)
+
+3. Install SMAPI. Follow the instructions for your platform on [the official website](https://smapi.io/).
+4. Run the game. Profit.