Scetch the dev subcommand

src/dev/check.rs

@@ -0,0 +1,5 @@
+use anyhow::Result;
+
+pub fn check() -> Result<()> {
+    todo!()
+}

src/dev/init.rs

@@ -0,0 +1,5 @@
+use anyhow::Result;
+
+pub fn init() -> Result<()> {
+    todo!()
+}