Add usage guide

README.md

@@ -1,7 +1,8 @@
 <img align="left" src=".github/readme_assets/icon.png" alt="logo">
 
 # Simple Custom SSG Template
-A simple Python template to start building a static site generator from.
+This is a template project that you can use as a base for your own website,
+generated by your own custom Static Site Generator, with Python.
 
 Designed to be hosted on GitHub Pages,
 so this template includes a GitHub Actions workflow
@@ -22,3 +23,16 @@ Contains the static files that will be copied to the build folder.
 
 ### templates
 Contains the HTML templates that will be used to generate the static site from.
+
+## Using this template
+1. Click the green `Use this template` button in the top right and `Create a new repository`
+2. Choose a descriptive repository name, like "My-Cool-Website" or something, and optionally fill in the description
+3. Click the green `Create repository` button in the bottom right
+4. Once it's done, go to the `Settings` tab on the top
+5. Go to the `Pages` section in the side bar on the left
+6. In the **Build and deployment** section, click the `Source` dropdown, and choose `GitHub Actions`
+7. Now go to the `Actions` tab on the top, and then go to the `Build` section in the side bar on the left
+8. Click the `Run workflow` dropdown on the right, verify that it says "branch: main", and then click the green `Run workflow` button
+9. After a few seconds, a new entry called "Build" should show up. Click that
+10. After another few seconds, the yellow circle should become a green checkmark
+11. The link to your website should show up now!