add link to project-docs folder.

Author: fdiblen

README.dev.md

@@ -4,6 +4,8 @@ We're developing the wireframes and interaction designs over at [https://www.fig
 
 `cffinit` is a Single Page App written in [TypeScript](https://www.typescriptlang.org/) using [Vue.js v3](https://v3.vuejs.org/) and [its composition API](https://v3.vuejs.org/api/composition-api.html).
 
+The notes about technology choices, design, personas can be found in [project-docs/](project-docs/) folder.
+
 ## Clone the repository
 
 ```shell