add achievement app

services/backend/apps/achievement/models.py

@@ -0,0 +1,22 @@
+from django.db import models
+
+from apps.core.models import BaseModel
+
+class Achievement(BaseModel):
+    def image_url_upload_to(instance, filename):
+        return f"/achievements/{instance.id}/icon"
+
+    name = models.CharField(max_length=30, verbose_name="название",
+                            unique=True)
+    description = models.TextField(verbose_name="описание")
+    icon = models.FileField(
+        verbose_name="иконка достижения",
+        upload_to=image_url_upload_to,
+    )
+
+    def __str__(self):
+        return self.name
+
+    class Meta:
+        verbose_name = "ачивка"
+        verbose_name_plural = "ачивки"