add get latest (all) device status to YAML (A.P.I.) file.

app/api.py

@@ -32,3 +32,6 @@ def get_all_status_log(device):
 
 def get_all_status_logs_for_every_device():
     return get_services.get_all_status_changes_from_database()
+
+def get_current_status_for_all_devices():
+    return get_services.get_latest_status_for_all_devices()

app/swagger.yml

@@ -413,3 +413,28 @@ paths:
           schema:
             type: object
             additionalProperties: True
+            
+  /status/latest:
+    get:
+      operationId: api.get_current_status_for_all_devices
+      tags:
+        - Request Device Status
+      summary: >-
+        Returns the last recorded status change of every device in the
+        database.
+      description: >-
+        Use this U.R.L. to retrieve the last recorded status change of
+        every device used in this project. There is no example of the
+        data returned because I can't seem to replicate it as a YAML
+        schema which is understood by Swagger. Because of this. the
+        return type is registered as a free-form object. To see what
+        the data looks like when it is returned, I recommend you use
+        the "Try it out!" button to see a working example.
+      responses:
+        200:
+          description: >-
+            The last recorded status change of every device in this
+            project was retrieved successfully.
+          schema:
+            type: object
+            additionalProperties: True