feat: add an mdBook guide

MDBOOK.md

@@ -0,0 +1,46 @@
+# mdBook
+
+Details about our mdBook setup.
+
+## Installation
+
+To install cargo, run the following command:
+
+```bash
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+```
+
+To install mdBook, run the following command:
+
+```bash
+cargo install mdbook
+```
+
+## Usage
+
+To build the book, run the following command:
+
+```bash
+mdbook build
+```
+
+To serve the book, run the following command:
+
+```bash
+npx serve book -p 3000
+```
+
+## Configuration
+
+The configuration file is located at `book.toml`.
+
+We've enabled the following features:
+
+* **Giscus**: To enable comments on the book. See [mdbook-embedify](https://mr-addict.github.io/mdbook-embedify/third-party/giscus.html) for more details.
+* **Mermaid**: To enable diagrams in the book. See [mdbook-mermaid](https://github.com/badboy/mdbook-mermaid) for more details.
+
+## Deployment
+
+TBD
+
+See: <https://github.com/rust-lang/mdBook/blob/master/.github/workflows/deploy.yml>