Updated What are UHC (markdown)

What-are-Scenarios.md

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+# Scenarios 
+Scenarios for UHC are like plugins for server.    
+Download them then put them in your scenarios folder to add them.     
+To add a scenario to your UHC game, you need to be in waiting for more players, then type "/uhc scenarios add <****Scenario name>"    
+    
+## How to create a scenario?
+**Requirements**:    
+- PHP knowledges. You can learn it on [CodeAcademy](https://www.codecademy.com/en/learn/php)    
+- Some pocketmine API knowledeges that are essentials to know how to code it.    
+
+If you know all those, let's start:    
+First, create a new File that will be your scenario code named **"YOUR_SCENARIO_NAME.php"**.    
+Then, you'll need to add the class that will be your main class. So to do that, add some code inside:
+><?php    
+># This is an example !
+>class YOUR_SCENARIO_NAME extends \Ad5001\UHC\scenario\Scenario {
+>
+>
+>}

What-are-UHC.md

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-Welcome to the UHC wiki!