Add initial project structure with core functionality for book and stationery uploads

- Created main application entry point in `main.go`.
- Added configuration management in `config/config.go` and tests in `config/config_test.go`.
- Implemented handlers for book and stationery uploads in `handlers/book.go` and `handlers/stationery.go`, including validation logic.
- Established database connection and services in `services/database.go` and `services/book_service.go`.
- Defined models for books and stationery in `models/book.go` and `models/stationery.go`.
- Set up Firebase integration for image uploads in `services/firebase.go`.
- Created migration scripts for database schema in `migrations/001_create_tables.sql` and subsequent updates.
- Added CORS and error handling middleware.
- Included comprehensive tests for handlers, services, and utilities.
- Documented API endpoints and usage in `README.md` and migration instructions in `migrations/README.md`.
- Introduced `.gitignore` to exclude unnecessary files and directories.
- Added Go module support with `go.mod` and `go.sum` files.
- Implemented utility functions for slug generation and validation in `utils/slug.go` and `utils/validation.go`.

handlers/stationery_test.go

@@ -0,0 +1,72 @@
+package handlers
+
+import (
+	"bytes"
+	"mime/multipart"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+func TestUploadStationery(t *testing.T) {
+	// This test requires database and Firebase to be initialized
+	// Skip if not available
+	t.Skip("Skipping UploadStationery test - requires database and Firebase")
+
+	app := fiber.New()
+	app.Post("/api/stationery", UploadStationery)
+
+	// Create multipart form with test data
+	body := &bytes.Buffer{}
+	writer := multipart.NewWriter(body)
+
+	// Add form fields
+	writer.WriteField("stationery_name", "Test Pen")
+	writer.WriteField("cost", "2.50")
+	writer.WriteField("price", "5.99")
+	writer.WriteField("quantity", "200")
+	writer.WriteField("category", "Writing")
+	writer.WriteField("color", "Blue")
+
+	// Add image file
+	part, _ := writer.CreateFormFile("image", "test.png")
+	part.Write([]byte("fake image data"))
+
+	writer.Close()
+
+	req := httptest.NewRequest("POST", "/api/stationery", body)
+	req.Header.Set("Content-Type", writer.FormDataContentType())
+
+	resp, err := app.Test(req)
+	if err != nil {
+		t.Fatalf("Test request failed: %v", err)
+	}
+
+	if resp.StatusCode != fiber.StatusCreated {
+		t.Errorf("Expected status %d, got %d", fiber.StatusCreated, resp.StatusCode)
+	}
+}
+
+func TestUploadStationery_ValidationErrors(t *testing.T) {
+	app := fiber.New()
+	app.Post("/api/stationery", UploadStationery)
+
+	// Test missing required field
+	body := &bytes.Buffer{}
+	writer := multipart.NewWriter(body)
+	writer.WriteField("stationery_name", "") // Empty stationery name
+	writer.Close()
+
+	req := httptest.NewRequest("POST", "/api/stationery", body)
+	req.Header.Set("Content-Type", writer.FormDataContentType())
+
+	resp, err := app.Test(req)
+	if err != nil {
+		t.Fatalf("Test request failed: %v", err)
+	}
+
+	if resp.StatusCode != fiber.StatusBadRequest {
+		t.Errorf("Expected status %d, got %d", fiber.StatusBadRequest, resp.StatusCode)
+	}
+}