chore: add lesson_03 pre-work (#65)

Signed-off-by: Anthony D. Mays <[email protected]>

Author: anthonydmays

lesson_03/README.md

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+# Lesson 03: How Computers Work ([Slides](https://code-differently.github.io/code-differently-24-q4/slides/#/lesson_03))
+
+## Pre-work
+
+Please review the following resources before lecture:
+
+* [Exploring How Computers Work (Video)](https://www.youtube.com/watch?v=QZwneRb-zqA&list=RDCMUCmtyQOKKmrMVaKuRXz02jbQ&index=1)
+* [What does what in your computer? Computer parts Explained (Video)](https://www.youtube.com/watch?v=ExxFxD4OSZ0)
+
+## Homework
+
+- [ ] Review [important reminders below](#important-reminders).
+- TODO(anthonydmays): Add more details
+
+### Important reminders
+
+* Make sure to sync your fork before creating a branch in order to pull in the latest changes.
+* Sync your branch often to avoid merge conflicts and execute `git pull` to bring the latest changes to your machine.
+* If your branch is too far behind or you run into too many issues, feel free to delete and re-create your repository. Make sure to review the article linked at the bottom of the [lesson_00](/lesson_00/README.md) README for instructions on how to create your fork and branch properly.
+* Remember, you should not reuse a branch you've used to submit a pull request. If you need to make changes, create a new branch and work from there after you've updated your fork to the latest.