Added a README that explains the folder structure

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+# About the folder structure
+
+* **db** - all modules that are accesing the data structure and are communicating directly to the database
+* **handler** - all modules that responds directly to requests/messages of the browser
+* **utils** - helper modules
+
+# Module name conventions
+
+Module file names starts with a capital letter and uses camelCase
+
+# Where does it start?
+
+server.js is started directly