Add new file

README.md

+```mermaid
+graph TD
+    A[Start] --> B[Enter Program]
+    B --> C[Get User Input]
+    C --> D[Username]
+    C --> E[Budget]
+    E --> F{Mode Selection}
+    F -->|Individual Components| G[Display Component Categories]
+    F -->|Full PC Build| H[Display Pre-configured Builds]
+    G --> I[Select Component Category]
+    I --> J[Display Inventory for Selected Category]
+    J --> K[Select Component]
+    H --> L[Display Available Builds within Budget]
+    L --> M[Select Build]
+    K --> N[Add to Cart]
+    M --> N
+    N --> O{Continue Shopping?}
+    O -->|Yes| F
+    O -->|No| P[Proceed to Checkout]
+    P --> Q[End]
+```
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