Add docs

.gitignore

@@ -1,3 +1,4 @@
 target/
 .vscode/
 examples_out/
+book/

book.toml

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+[book]
+authors = ["Garrit Franke"]
+language = "en"
+multilingual = false
+src = "docs"
+title = "The Sabre Programming Language"

docs/SUMMARY.md

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+# Introduction
+
+- [Introduction](./introduction/SUMMARY.md)
+  - [Overview](./introduction/overview.md)
+  - [Installation](./introduction/installation.md)

docs/introduction/SUMMARY.md

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+# Introduction

docs/introduction/installation.md

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+# Installation
+
+## Git
+
+The fastest way to get up and running is to clone the [repository](https://git.sr.ht/~garritfra/sabre) and run the following command:
+
+```sh
+cargo install --path .
+```
+
+> **Note:** An installation of the Rust programming language is needed to compile Sabre.
+
+## Cargo
+
+TODO

docs/introduction/overview.md

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+# Overview
+
+Sabre is a bullshit-free (©) programming language that gets out of your way.
+It is meant to "just work", without adding unnecessary and bloated language features.

src/SUMMARY.md

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+# Summary
+
+- [Chapter 1](./chapter_1.md)

src/chapter_1.md

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+# Chapter 1