#31 API basic implementation

* adds new app to project
* adds relation between User model and new APIUserToken model
* adds first implementation for GET of intervention
* adds basic code layout for future extension by having new versions

api/models/__init__.py

@@ -0,0 +1,8 @@
+"""
+Author: Michel Peltriaux
+Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
+Contact: michel.peltriaux@sgdnord.rlp.de
+Created on: 21.01.22
+
+"""
+from .token import *

api/models/token.py

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+from django.db import models
+
+from konova.utils.generators import generate_token
+
+
+class APIUserToken(models.Model):
+    token = models.CharField(
+        primary_key=True,
+        max_length=1000,
+        default=generate_token,
+    )
+    valid_until = models.DateField(
+        blank=True,
+        null=True,
+        help_text="Token is only valid until this date",
+    )
+    is_active = models.BooleanField(
+        default=False,
+        help_text="Must be activated by an admin"
+    )
+
+    def __str__(self):
+        return self.token