add zshrc config to setup if it exists (#20)

rust/crates/mesc_cli/src/cli/subcommands/setup/command.rs

@@ -1,7 +1,7 @@
 use crate::{MescCliError, SetupArgs};
 use mesc::{MescError, RpcConfig};
-use toolstr::Colorize;
 use std::path::PathBuf;
+use toolstr::Colorize;
 
 use super::{config_modification::*, inquire_utils::*, selectors::*, shell_config::*, writing::*};
 
@@ -25,7 +25,10 @@ pub(crate) async fn setup_command(args: SetupArgs) -> Result<(), MescCliError> {
         let result = modify_existing_config(config, Some(mode)).await;
         if shell_config_modified {
             println!();
-            println!("{}", "Shell config files were modified. Restart shell to load these files.".magenta())
+            println!(
+                "{}",
+                "Shell config files were modified. Restart shell to load these files.".magenta()
+            )
         }
         result
     }

rust/crates/mesc_cli/src/cli/subcommands/setup/shell_config.rs

@@ -19,7 +19,15 @@ pub(crate) fn get_shell_config_paths() -> Result<Vec<PathBuf>, MescCliError> {
     let home_dir =
         std::env::var("HOME").map_err(|_| MescCliError::Error("home dir not found".to_string()))?;
     let home_path = PathBuf::from(home_dir);
-    let candidates = vec![home_path.join(".bashrc"), home_path.join(".profile")];
+    let mut candidates = vec![home_path.join(".bashrc"), home_path.join(".profile")];
+
+    // paths added only if they exist
+    for path in [home_path.join(".zshrc")] {
+        if path.exists() {
+            candidates.push(path)
+        }
+    }
+
     Ok(candidates)
 }