Create README.md

Author: thoo0224

README.md

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+# java-wrapper
+Java/Kotlin implementation for https://fortnite-api.com
+
+
+# Example
+Note: For every method you can use the `Language` parameter.
+```java
+FortniteAPI api = new FortniteAPIBuilder()
+                  .setKey("{API-KEY}");
+CosmeticEndpoint endpoint = api.getCosmeticEndpoint();
+FortniteResponse<BaseModel<BrCosmetic>> response = endpoint.getCosmetics();
+response.ifSuccessfull(cosmetics -> {
+  for(BrCosmetic cosmetic : cosmetics){
+    System.out.println(cosmetic.name);
+  }
+});
+```