Done dev init

src/dev.rs

@@ -1,4 +1,4 @@
-use anyhow::Result;
+use anyhow::{Context, Result};
 use clap::Subcommand;
 
 mod check;
@@ -13,8 +13,11 @@ pub enum DevCommands {
 impl DevCommands {
     pub fn run(self) -> Result<()> {
         match self {
-            DevCommands::Init => init::init(),
+            DevCommands::Init => init::init().context(INIT_ERR),
             DevCommands::Check => check::check(),
         }
     }
 }
+
+const INIT_ERR: &str = "Initialization failed.
+After resolving the issue, delete the `rustlings` directory (if it was created) and try again";