Created Use Cases for EV Charging Transaction

docs/EV-Charging-use-case.md

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+
+
+<!-- ## 1. Discovery of Charging Sources -->
+
+```mermaid
+sequenceDiagram
+    participant User
+    participant System
+    participant ChargingStation
+
+    User->>System: Discover Charging Sources\n(By location, charger type, vehicle type, operator, etc)
+    System->>ChargingStation: Retrieve Charging Station Information
+    ChargingStation-->>System: Charging Station Info\n(Location, Charger Type, Vehicle Type, Operator)
+    System-->>User: Provide Charging Station Info
+
+## 2. Placing an Order for Charge 
+
+    User->>System: Place Charging Order\n(By time, money, number of units)
+    System->>ChargingStation: Fetch Quote
+    ChargingStation-->>System: Quote Details\n(Estimated Cost)
+    System-->>User: Provide Quote Details
+
+    User->>System: Agree to Terms\n(Terms of Service, Payment, etc.)
+    System-->>User: Confirmation\n(Advance/Instant)
+
+## 3. Fulfillment of a Charging Order
+
+    User->>ChargingStation: Start Charging
+    ChargingStation-->>System: Status Updates\n(Real-time status, Order Updates)
+    System-->>User: Provide Status Updates
+
+    User->>ChargingStation: Real-Time Tracking\n(Power Delivery Information)
+    ChargingStation-->>System: Power Delivery Information
+    System-->>User: Provide Power Delivery Information
+
+    User->>ChargingStation: Cancellation
+    ChargingStation-->>System: Cancellation Acknowledgment
+    System-->>User: Provide Cancellation Acknowledgment
+
+## 4. Post-Charging Interactions
+
+    User->>System: Rating
+    System-->>User: Rating Acknowledgment
+
+    User->>System: Grievance/Support
+    System->>ChargingStation: Forward Grievance/Support Request
+    ChargingStation-->>System: Grievance/Support Acknowledgment
+    System-->>User: Provide Grievance/Support Acknowledgment
+
+    User->>System: Refund Request
+    System-->>User: Refund Processing Status
+
+```