add model

src/main/java/ntnu/idatt2016/v233/SmartMat/model/Allergy.java

+package ntnu.idatt2016.v233.SmartMat.model;
+
+/**
+ * This is a record class representing an allergy
+ * 
+ * @author Stian Lyng
+ * @version 1.0
+ *
+ * @param name The name of the allergy
+ * @param description The description of the allergy
+ */
+public record Allergy(String name, String description) {
+}
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