Add examples

Author: erickhun

example.php

@@ -0,0 +1,19 @@
+<?php
+require_once('./src/php-bufflog/BuffLog.php');
+
+use Buffer\Bufflog;
+
+Bufflog::debug("I am a debug");
+Bufflog::debug("I am a debug with context", ["my key" => " my value"]);
+
+Bufflog::info("I am an info");
+Bufflog::debug("I am a info with context", ["my key" => " my value"]);
+
+Bufflog::warn("I am a warning");
+Bufflog::warn("I am a warning", ["duration" => "40ms"]);
+
+Bufflog::error("I am an error");
+Bufflog::error("I am an error", ["mean" => "70"]);
+
+Bufflog::critical("I am critical information!");
+Bufflog::critical("I am critical information!", ["user" => "betrand"]);