docs: check off hello-world app task in README

README.md

@@ -53,7 +53,7 @@ Once a task is completed, it should be checked off.
 - [x] Update the build script to generate a ramdisk containing any applications to run. This initial ramdisk is in CPIO format.
 - [x] Write a VFS subsystem.
 - [x] Write a VFS driver that provides the contents of the CPIO initial ramdisk to the VFS layer.
-- [ ] Create a `hello-world` app. It should print `Hello, World` to its own stdout. The kernel should route this to Qemu and to the VGA dispaly. Ensure this work.
+- [x] Create a `hello-world` app. It should print `Hello, World` to its own stdout. The kernel should route this to Qemu and to the VGA dispaly. Ensure this work.
 - [ ] Implement the fork system call.
 - [ ] Implement environment variables. Apps should be able to modify this, and it should be copied to new forks of an app.
 - [ ] Create a basic shell program `sh`. This shell must be able to start the hello-world app. It must include `cd` as a built-in to change the current working directory.