Start config parsing code

src/config.rs

@@ -0,0 +1,16 @@
+use std::str::FromStr;
+use toml_edit::{Document, Table, Array, TomlError};
+
+struct Buttons<'a>(&'a Table);
+
+struct Config(Document);
+
+impl Config {
+    fn new(s: &str) -> Result<Self, TomlError> {
+        Ok(Self(Document::from_str(s)?))
+    }
+
+    fn buttons(&self) -> Option<Buttons> {
+        Some(Buttons(self.0.as_table().get("buttons")?.as_table()?))
+    }
+}