Updated documentation

docs/personal-documentation/Luca/infrastructure-design.md

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+### Infrastructure Design
+
+---
+
+```mermaid
+
+graph TB
+    subgraph "Raspberry Pi"
+        server[NodeJS Server\nHandles requests for\nexercises]
+        db[Database]
+        server --Fetch exercise--> db
+        db --Exercise--> server
+        
+    end
+
+    subgraph "Pepper Robot"
+        webServer[Web Server\n\nHandles incoming rotational data\nfrom ESP8266]
+        motionProcessor[Motion Processor\n\nProcesses rotational data,\ncompares it to the current exercise\nand shows the statistics on the screen]
+        motionProcessor --Send HTTP GET for Exercise--> server
+        server --Send exercise in JSON format--> motionProcessor
+        webServer --Process rotational data--> motionProcessor
+    end
+
+    subgraph "Motion Sensing Device"
+        esp[ESP8266\n\nMeasures sensor data\nand sends it to the web server]
+        gyro[Gyroscope\n\nMeasures rotational data\nand sends it to the ESP8266]
+        esp --Send rotational data\nto Pepper Web Server--> webServer
+        gyro <--> esp
+    end
+
+```