Start implementing a config

Cargo.toml

@@ -14,3 +14,5 @@ serde_json = "1.0.59"
 clap = "3.0.0-beta.2"
 users = "0.11.0"
 swayipc = "2.7.2"
+toml = "0.5.8"
+directories = "3.0"

src/config.rs

@@ -0,0 +1,17 @@
+#[derive(Serialize, Deserialize)]
+pub struct Config {
+    launcher: Option<Launcher>,
+    format: Option<Format>,
+}
+
+#[derive(Serialize, Deserialize)]
+pub struct Launcher {
+    executable: Option<String>,
+    args: Option<Vec<String>>,
+}
+
+#[derive(Serialize, Deserialize)]
+pub struct Format {
+    window_format: Option<String>,
+    workspace_format: Option<String>,
+}