Create README.md

Author: skizzerz

README.md

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+This MediaWiki extension contains the functionality custom to https://werewolf.chat.
+
+## Installation
+To install, first clone the repository into your `extensions` directory, like so
+```
+git clone https://github.com/lykoss/wiki WerewolfWiki
+```
+
+Then, add the following to your `LocalSettings.php` file
+```php
+wfLoadExtension( 'WerewolfWiki' );
+```
+
+Verify the installation was successful by heading to Special:Version.