Add basic readme

readme.md

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+This repository contains the source for our website. It is generated into static HTML by [Zola](https://www.getzola.org).
+
+## Development
+
+You need to install [Zola](https://www.getzola.org/documentation/getting-started/installation/) and run a development server.
+
+```
+zola serve
+```
+
+It can be accessed at <http://127.0.0.1:1111> by default.
+
+## Resources
+
+- [Zola documentation](https://www.getzola.org/documentation/getting-started/overview/)
+- [Tera documentation](https://tera.netlify.app/docs) (template engine)