feat(docs): Add guide index page

docs/src/guide/index.md

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+---
+title: Introduction
+
+---
+
+# Introduction
+
+Vue Flow is a library for building node-based applications. These can be simple static diagrams or complex node-based
+editors. You can implement custom nodes and edges. It also comes with components like a mini-map, zoom pane controls and
+a background. 
+
+Check out the [examples](/examples/) if you want to dive directly into the code.
+
+# Features
+
+- 👶 __Easy to use__: Seamless zooming & panning behaviour and single and multi-selections of
+  elements
+
+- 🎨 __Customizable__: Different and edge types and support for custom nodes with multiple handles and custom edges
+
+- 🚀 __Fast rendering__: Only nodes that have changed are re-rendered and only those that are in the viewport are displayed (optionally)
+
+- 🧲 __Handy utilities__: Comes with graph helper and state composable functions for advanced uses
+
+- 📦 __Additional Components__:
+
+  - 🖼 Background: With two built-in patterns and some configuration options like height, width or color.
+
+  - 🧭 Minimap: Shows current nodes in a small map shape in the bottom right corner
+
+  - 🕹 Controls: Control zoom behavior from a panel on the bottom left
+
+- 🦾 __Reliable__: Fully written in TypeScript
+
+::: warning
+  Vue Flow is still version 0.x.x.
+  
+  Expect breaking changes between versions!
+:::