Rename Model to Whisper and make an initial working model

It performs some basic operations without erroring altrough it doesn't do any whisper-special things

Author: m1guelpf

src/ClientInterface.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace LaravelWhisper\Whisper;
+
+interface ClientInterface
+{
+    public static function find($identifier) : array;
+
+    public static function all() : array;
+
+    public static function update($identifier, array $data) : void;
+
+    public static function delete($identifier) : ?bool;
+
+    public static function create(array $data) : array;
+}