feat(command): add RemoveFirst command

app/src/main/kotlin/app/AppInitializer.kt

@@ -7,6 +7,7 @@ import command.commands.Exit
 import command.commands.Help
 import command.commands.Info
 import command.commands.RemoveById
+import command.commands.RemoveFirst
 import command.commands.Show
 import command.commands.Update
 import io.IOHandler
@@ -28,5 +29,6 @@ class AppInitializer {
         commandManager.register(Info(io, collectionManager))
         commandManager.register(Update(io, collectionManager))
         commandManager.register(RemoveById(io, collectionManager))
+        commandManager.register(RemoveFirst(io, collectionManager))
     }
 }

app/src/main/kotlin/command/commands/RemoveFirst.kt

@@ -0,0 +1,22 @@
+package command.commands
+
+import command.Command
+import io.IOHandler
+import manager.CollectionManager
+import reader.ProductReader
+
+class RemoveFirst(
+    private val io: IOHandler,
+    private val collectionManager: CollectionManager,
+) : Command {
+    override val name = "remove_first"
+    override val description = "remove first element"
+
+    override fun execute(args: String) {
+        if (collectionManager.getCollection().isNotEmpty()) {
+            collectionManager.removeFirst()
+        } else {
+            io.println("коллекция пустая, невозможно удалить первый элемент")
+        }
+    }
+}

app/src/main/kotlin/manager/CollectionManager.kt

@@ -59,6 +59,11 @@ class CollectionManager(
         io.println("элемент удален")
     }
 
+    fun removeFirst() {
+        list.removeFirst()
+        io.println("первый элемент удален")
+    }
+
     fun getCollection(): LinkedList<Product> = list
 
     fun clear() {