Update docs

Author: mihatorikei

docs/index.md

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+
+# Codeigniter Vite Documentation
+
+- [Installation](install.md)

docs/install.md

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+# Installation
+
+`
+### IMPORTANT: 🚧 THIS DOCUMENTATION IS NOT YET COMPLETE (UNSTABLE) 🚧
+`
+
+These instructions assume that you have already installed [composer](https://getcomposer.org/download/) and [CodeIgniter 4 app starter](https://codeigniter.com/user_guide/installation/installing_composer.html).
+
+from your project root run:
+```
+composer require mihatori/codeignitervite
+```
+
+then:
+```
+php spark vite:init
+```
+
+or
+```
+php spark vite:init --framework <framework>
+```
+replace `<framework>` with `vue`, `react`, `svelte` or `none`.
+
+That's all, you can now run `npm install`, `npm run dev` and start coding.
+
+## What happened?
+
+no need to explain composer command, but `php spark vite:init` did the hardest part.
+
+let's make it clear:
+
+- Generated `vite.config.js`, `package.json` in your project root.
+- Created a `resources` folder in you project root with the following files:
+    - `main.js` - your frontend entry file.
+    - Main component eg: `App.vue`, `App.svelte`, `App.jsx` depends on the framework you selected.
+- Added some useful variables in your `.env` file, make sure to check them out.