Feature/communications

Tsi1.Api/Tsi1.DataLayer/Entities/Communication.cs

+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Tsi1.DataLayer.Entities
+{
+    public class Communication
+    {
+        public int Id { get; set; }
+
+        public string Text { get; set; }
+
+        public DateTime ValidUntil { get; set; }
+
+        public Course Course { get; set; }
+
+        public Tenant Tenant { get; set; }
+    }
+}