feat: add Unit Price Calculator

app/apps/mini_tools/admin.py

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+from django.contrib import admin
+
+# Register your models here.

app/apps/mini_tools/apps.py

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+from django.apps import AppConfig
+
+
+class MiniToolsConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "apps.mini_tools"

app/apps/mini_tools/models.py

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+from django.db import models
+
+# Create your models here.

app/apps/mini_tools/tests.py

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+from django.test import TestCase
+
+# Create your tests here.

app/apps/mini_tools/urls.py

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+from django.urls import path
+
+from . import views
+
+urlpatterns = [
+    path(
+        "tools/unit-price-calculator/",
+        views.unit_price_calculator,
+        name="unit_price_calculator",
+    ),
+]

app/apps/mini_tools/views.py

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+from django.contrib.auth.decorators import login_required
+from django.shortcuts import render
+
+
+@login_required
+def unit_price_calculator(request):
+    return render(request, "mini_tools/unit_price_calculator.html")