add free-project audit

subjects/free-project/audit/README.md

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+#### Required
+
+###### Is the `index.html` webpage displayed properly ?
+
+###### Is css applied from the `style.css` file ?
+
+###### Are scripts loaded from `script.js` file and no errors shown in the console ?
+
+#### Optional
+
+###### +Did you use a service to publish it ? (github pages or equivalent)
+
+###### +Does the webpage work on multiple window size ? (phone, tablets, computers...)