Fix namespace in composer file, add readme + test file

Corelibs -> CoreLibs

test/ folder for test files (future phpunit test)

vendor/composer/autoload_psr4.php

@@ -6,5 +6,5 @@ $vendorDir = dirname(__DIR__);
 $baseDir = dirname($vendorDir);
 
 return array(
-    'Egrajp\\CorelibsComposerAll\\' => array($baseDir . '/src'),
+    'CoreLibs\\' => array($baseDir . '/src'),
 );