Added assinment and user

buisnesslogic/src/main/java/com/plannaplan/entities/Assignment.java

@@ -0,0 +1,24 @@
+package com.plannaplan.entities;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.ManyToOne;
+
+@Entity
+public class Assignment {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+    @ManyToOne
+    @JoinColumn(name = "group_id")
+    private Groups group;
+    @ManyToOne
+    @JoinColumn(name = "user_id")
+    private User user;
+
+    public Assignment() {
+    }
+}