add repository

src/main/java/ntnu/idatt2016/v233/SmartMat/repository/AllergyRepository.java

+package ntnu.idatt2016.v233.SmartMat.repository;
+
+import ntnu.idatt2016.v233.SmartMat.model.Allergy;
+
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * Repository for allergies
+ * 
+ * @author Stian Lyng
+ * @version 1.0
+ * @since 04.04.2023
+ */
+public interface AllergyRepository {
+    /**
+     * Saves a allergy to the database
+     *
+     * @param allergy Allergy to save
+     */
+    Allergy save (Allergy allergy);
+
+    /**
+     * Gets an allergy by name
+     *
+     * @param name the name of the allergy
+     * @return an optional containing the Allergy if it exists
+     */
+    Optional<Allergy> getByName(String name);
+
+    /**
+     * Gets all allergies
+     *
+     * @return an optional containing a list of all allergies
+     */
+    Optional<List<Allergy>> getAll();
+
+
+    /**
+     * Deletes an allergy by its name
+     *
+     * @param name the name of the allergy
+     */
+    void deleteById(String name);
+
+}