Add Service Manual (Intern)

Service-Manual-%28Intern%29.md

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+# Service Manual (Intern)
+
+Version: v0.6.0 Beta
+
+## Debug Mode
+
+-   Deaktivér startup script
+-   Kør print agent manuelt
+-   Kontrollér logs
+
+------------------------------------------------------------------------
+
+## Print Problemer
+
+-   Genstart agent
+-   Test ESC/POS direkte
+-   Tjek USB device manager
+
+------------------------------------------------------------------------
+
+## Database
+
+-   Kontrollér database fil
+-   Verificér write permissions