Fix README formatting

README.md

@@ -4,6 +4,7 @@
 
 Content for this site is located in the src directory in a content folder. The content is formatted using mdx, and utilizes [markdown formatting](https://www.markdownguide.org/basic-syntax/). 
 
+```plaintext
 .
 └── src
  ├── content
@@ -12,6 +13,7 @@ Content for this site is located in the src directory in a content folder. The c
  ├── license.mdx
  ├── resources.mdx
  └── tools.mdx
+```
 
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