Add docker instructions

README.md

@@ -47,9 +47,24 @@ If you decide to use HTTPS remotes, you might want to run `git config --global c
 
 If you need training to use Git, visit [Git Course in Plussa][git-plussa].
 
+## Docker instructions
+
+1. Install yocto as a submodule as instructed on the first assignment
+2. Install docker on your machine. [Instructions][docker-install-instructions]
+3. Download yocto cache files and extract them to cache/
+4. Change directory to scripts/
+5. Build the image by executing ./build_docker_image.sh
+6. To run the container execute ./run_docker_container.sh
+
+The sstate_cache files are mounted in the container to /opt. Similar to the virtual machine provided. This allows parallel development with both environments.
+The whole project is mounted to /home/yocto/yocto. 
+**Note**: All paths need to be relative. Use ${TOPDIR} to refer to the project root in yocto configs. 
 
 [moodle.COMP.CE.460]: https://moodle.tuni.fi/course/view.php?id=50067
 [git-plussa]: https://plus.tuni.fi/tie-git/
 [course_upstream project]: https://course-gitlab.tuni.fi/comp-ce-460-embedded-linux-drivers_2025-2026/course_upstream
 [semipermanent-ssh-keys]: semipermanent-ssh-keys.md
 [update_from_course_upstream]: https://course-gitlab.tuni.fi/comp-ce-460-embedded-linux-drivers_2025-2026/course_upstream/raw/main/scripts/update_from_course_upstream.sh
+[docker-install-instructions]: https://docs.docker.com/engine/install/
+
+