add swagger docs to signin and signup endooints

services/backend/apps/users/models.py

@@ -0,0 +1,16 @@
+from django.db import models
+
+from apps.core.models import BaseModel
+
+
+class User(BaseModel):
+    email = models.EmailField(unique=True, verbose_name="Почта")
+    username = models.SlugField(unique=True, verbose_name="Юзернейм")
+    password = models.TextField(verbose_name="Пароль")
+
+    def __str__(self):
+        return self.username
+
+    class Meta:
+        verbose_name = "пользователь"
+        verbose_name_plural = "пользователи"