Add src/server/readme.md

src/server/readme.md

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+# Usage
+
+First Clone the Repo to a generated folder. 
+Then install all the dependencies.
+
+1) Start the server.js with nodemon.
+2) start the Client folder with npx http-server.
+3) Upload the Arduino Reading Sketch on the ESP32. 
+4) Open all 4 Windows.
+5) Scan a Card