add say

src/command/mod.rs

@@ -0,0 +1,17 @@
+pub struct Command(String);
+
+mod say;
+
+impl Command {
+    pub fn raw(cmd: &str) -> Self {
+        Self(cmd.to_string())
+    }
+
+    pub fn as_str(&self) -> &str {
+        &self.0
+    }
+
+    pub fn say() -> say::SayCommand {
+        say::SayCommand::default()
+    }
+}