add instructions to readme

Readme.md

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+# Setup
+
+`ncmprs` requires a `config.toml` file that points to your FLAC music library.
+
+## Linux
+
+1. Create the configuration directory:
+   ```sh
+   mkdir -p "$XDG_CONFIG_HOME/ncmprs"
+   ```
+
+2. Create the configuration file:
+   ```sh
+   touch "$XDG_CONFIG_HOME/ncmprs/config.toml"
+   ```
+
+3. Add the path to your music library:
+   ```toml
+   library_path = "/path/to/your/music"
+   ```
+
+---
+
+## Windows
+
+1. Create the configuration directory:
+   ```
+   C:\Users\<YourUser>\AppData\Roaming\ncmprs\
+   ```
+
+2. Create a file named `config.toml` inside that directory.
+
+3. Add the path to your music library:
+   ```toml
+   library_path = "Z:\\Users\\<YourUser>\\Music"
+   ```
+
+> **Note:** Windows paths in TOML require backslashes to be escaped (`\\` instead of `\`).