Add 'Translation'

Translation.md

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+KnarLib has a general-purpose translator which is simple, but powerful. It automatically allows any translatable strings to be overridden by the server owner, which also allows anyone to add a custom language.
+
+The basic translation format is as follows, and should be placed in the resource folder in strings.yml:
+```yaml
+languageCode:
+  TRANSLATABLE_STRING_1: "The text to be displayed as the translation"
+  TRANSLATABLE_STRING_2: "The different text to be displayed as the translation"
+```
+
+Example:
+```yaml
+en:
+  PLUGIN_RELOADED: "Successfully reloaded"
+  PERMISSION_DENIED: "You don't have the necessary permission"
+no:
+  PLUGIN_RELOADED: "Lastet inn på nytt"
+  PERMISSION_DENIED: "Du har ikke tilgang"
+```
+
+Language codes can use any format you want. So you could use "en", "en-US", "English" or whatever else. Just make sure to be consistent to avoid confusing your users. If a strings.yml file is found in the plugin folder, any translations in that will take precedence over the values set in your plugin, which allows full customization by the end-user. Color and formatting codes in translated messages will be automatically converted into formatted text. This behavior can be tweaked using `translator.setColorConversion`.
+
+To create your translatable messages, create a class extending `TranslatableMessage` like so:
+```java
+public enum MyTranslatableMessage implements TranslatableMessage {
+    TRANSLATABLE_STRING_1,
+    TRANSLATABLE_STRING_2
+    
+    //This is necessary for the translator to get available messages
+    @Override
+    public TranslatableMessage[] getAllMessages() {
+        return MyTranslatableMessage.values();
+    }
+}
+```
+
+If you've created your class, and strings.yml file, you can start using your translator. First, make a new translator. Then, register one message for each class you've made that extends `TranslatableMessage` using `translator.registerMessageCategory`. When that's done, use `translator.loadLanguages` to load your translations:
+```java
+Translator translator = new Translator();
+translator.registerMessageCategory(MyTranslatableMessage.TRANSLATABLE_STRING_1);
+//The data folder for your plugin | The default language, if translations are missing | The selected language
+translator.loadLanguages(this.getDataFolder(), "en", "no");
+```
+
+Now, your translator is ready for use. To get a translation, simply run `translator.getTranslatedMessage` on one of your messages:
+```java
+String translation = translator.getTranslatedMessage(MyTranslatableMessage.TRANSLATABLE_STRING_1);
+```