Code style to PSR-12, updated README/contribution guidelines

CONTRIBUTING.md

@@ -2,35 +2,15 @@
 Thanks for contributing to our project 🎉👍!
 
 ## 😉 Code of Conduct
-Everyone parcipating in this project must accept our [Code of Conduct](CODE_OF_CONDUCT.md) which rules the friendly together of all contributors.
+Every developer participating in this project must accept our [Code of Conduct](CODE_OF_CONDUCT.md) which rules the friendly together of all contributors.
 
 ## ❔ Questions
-Please ask questions on [Gitter](https://gitter.im/survanetwork/Worlds). You will get a faster answer there and don't disturb maintainers and contributors in the issue tracker.
+Please ask questions on [Discord](https://discord.gg/t4Kg4j3829). You will get a faster answer there and don't disturb maintainers and contributors in the issue tracker.
 
 ## ✉️ Issues and Pull Requests
-If you found a bug or have an idea how to improve or add a new feature, you're welcome to [open an issue](https://github.com/survanetwork/Worlds/issues/new). Please keep in mind this guidelines and [check if there is already an issue](https://github.com/survanetwork/Worlds/issues) with the same content like yours.
+If you found a bug or have an idea how to improve or add a new feature, you're welcome to [open an issue](https://github.com/survanetwork/Worlds/issues/new). Please keep those guidelines in mind and [check if there is already an issue](https://github.com/survanetwork/Worlds/issues) with the same content.
 
-Feel free to [open a pull request](https://github.com/survanetwork/Worlds/compare) if you fixed a bug or added or improved a feature.
+Feel free to [open a pull request](https://github.com/survanetwork/Worlds/compare) if you fixed a bug, added or improved a feature.
 
 ## 🎨 Code Style
-This project is using a custom code style. Please see existing code files for more information.
-
-Summary of the most important guidelines:
-
-- Files must always end with an empty line
-
-- Brackets are always written in the same line and with a space
-```
-function testThis() {
-    return "hello!";
-}
-```
-
-- There must be no space in front of commands like if and while
-```
-while(i < 5) {
-    if(e === 3) {
-        return true;
-    }
-}
-```
+This project is using the [PSR-12 code style](https://www.php-fig.org/psr/psr-12/).

README.md

@@ -20,8 +20,8 @@
     <a href="https://github.com/survanetwork/Worlds/blob/master/LICENSE">
         <img src="https://img.shields.io/badge/license-CC--BY--NC--SA--4.0-orange.svg" alt="License">
     </a>
-    <a href="https://gitter.im/survanetwork/Worlds">
-        <img src="https://img.shields.io/gitter/room/survanetwork/Worlds.svg" alt="Gitter">
+    <a href="https://discord.gg/t4Kg4j3829">
+        <img src="https://img.shields.io/discord/685532530451283997?color=blueviolet" alt="Discord">
     </a>
     <a href="https://twitter.com/survanetwork">
         <img src="https://img.shields.io/twitter/url?label=SURVA%20network%20on%20Twitter&style=social&url=https%3A%2F%2Ftwitter.com%2Fsurvanetwork" alt="Twitter">
@@ -94,7 +94,9 @@ Worlds is really easy to use. Here is the command syntax:
 /worlds defaults unset <permission|gamemode|build|pvp|damage|interact|explode|drop|hunger|fly|daylightcycle>
 ```
 
-For a full list of commands, their usage and a description what they are for, take a look at the [wiki](https://github.com/survanetwork/Worlds/wiki/Commands).
+For a full list of commands, their usage and a description what they are for, take a look at the [wiki](https://plugins.surva.net/docs/Worlds#commands).
+
+[Read the full documentation 📖](https://plugins.surva.net/docs/Worlds) • [Ask questions on Discord 💬](https://discord.gg/t4Kg4j3829)
 
 ## 🙋‍ Contribution
 Feel free to contribute if you have ideas or found an issue.