Additional .gitignored files, remove unused config

.gitignore

@@ -1,4 +1,5 @@
+/.vscode
 /.idea
+/.DS_Store
 /vendor
-composer.lock
-/public/*
+composer.lock

phpunit.xml

@@ -1,23 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<phpunit colors="true"
-         bootstrap="vendor/autoload.php"
-         displayDetailsOnIncompleteTests="true"
-         displayDetailsOnSkippedTests="true"
-         displayDetailsOnTestsThatTriggerDeprecations="true"
-         displayDetailsOnTestsThatTriggerWarnings="true"
-         displayDetailsOnTestsThatTriggerNotices="true"
-         failOnWarning="true"
-         failOnRisky="true">
-    <testsuites>
-        <testsuite name="Unit Tests">
-            <directory>tests</directory>
-        </testsuite>
-    </testsuites>
-
-    <coverage/>
-    <source>
-        <include>
-            <directory suffix=".php">src/</directory>
-        </include>
-    </source>
-</phpunit>