Add list users command

src/Service/DatabaseManager.php

@@ -29,7 +29,7 @@ class DatabaseManager
     public function createDatabase(string $name)
     {
         $dbs = $this->listDatabases();
-        if(in_array($name, $dbs)) {
+        if (in_array($name, $dbs)) {
             throw new \Exception(sprintf('Database "%s" already exists', $name));
         }
 
@@ -38,4 +38,20 @@ class DatabaseManager
             throw new \Exception(sprintf('Database create error: %s', $this->conn->error));
         }
     }
+
+    public function listUsers(): array
+    {
+        $results = $this->conn->query('select * from mysql.user');
+
+        $users = [];
+        while ($result = $results->fetch_object()) {
+            $users[] = [
+                'name' => $result->User,
+                'host' => $result->Host,
+                'plugin' => $result->plugin,
+            ];
+        }
+
+        return $users;
+    }
 }