feat(checks): Add new finction

diff - function which cheks differencies between 2 repo

src/operations/check.rs

@@ -0,0 +1,17 @@
+use super::*;
+use crate::rclone_install::RcloneApp;
+use serde_json::Value;
+
+/// Проверить разницу между двумя директориями
+pub fn diff(app: &RcloneApp, source: &str, dest: &str) -> Result<Vec<String>, String> {
+    let output = app.run_command(&["check", source, dest, "--combined", "-"])?;
+
+    let mut differences = Vec::new();
+    for line in output.lines() {
+        if !line.is_empty() {
+            differences.push(line.to_string());
+        }
+    }
+
+    Ok(differences)
+}