Expand README with project details and usage instructions

Added detailed information about the project, including requirements, usage, supported OS, and license.

README.md

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 # devil-fruit-encyclopedia
 An encyclopedia about One Piece devil fruits build with HTML, CSS and JS
+
+[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT)
+[![Status](https://img.shields.io/badge/Status-Beta-red.svg)](https://en.wikipedia.org/wiki/Software_release_life_cycle#Beta)
+
+# About
+A simple and small encyclopedia about the One Piece devil fruits built with HTML, CSS and JS.
+SPOILER-WARNING: THIS WEBSITE WILL SPOILER MANY FRUITS ASWELL AS DETAILS RELATED TO EACH FRUIT! VISIT AT YOUR OWN RISK!!
+
+# Requirements
+- `Web-Browser`: Firefox (recommended), Chrome / Chromium, Safari (if on MacOS)
+- `JavaScript`: enabled
+- `Internet`: active connection
+
+# Usage
+- View fruits: Users can view existing fruits (f. e. the "gomu gomu no mi", the Gum-Gum fruit)
+- Add fruits: Users can add fruits (f. e. the "bara bara no mi", Chop-Chop fruit)
+- Update fruits: Users can update fruits (those they added themself) to add / remove details
+- Delete fruits: Users can delete fruits they added
+
+# Supported OS
+- Linux, MacOS, FreeBSD, Windows, Android, iOS
+
+# Access
+1. (To be added)
+
+# License and Credits
+**Author**: [Cametendo](https://www.github.com/Cametendo)
+**License**: MIT
+
+## Note
+This is just a small school project. Because of that, I don't know if I'll continue after presenting the end result 
+- Cametendo