Added autoload

Author: jason490

composer.json

@@ -10,5 +10,8 @@
     "require-dev": {
         "php": "^7.2.5|^8.0",
         "phpunit/phpunit": "~6.0|~5.0|~8.0"
+    },
+    "autoload": {
+        "psr-0": { "Submitty": "src/" }
     }
 }