Started implementing backend

Logic/IPasswordStoreService.cs

@@ -0,0 +1,14 @@
+using Models;
+
+namespace Logic;
+
+public interface IPasswordStoreService
+{
+    IEnumerable<PasswordStore> GetAll();
+    PasswordStore Get(uint ID);
+    int Delete(uint ID);
+    int Delete(PasswordStore item);
+    int Create(string path, string? displayName = null, string? iconName = null);
+    int Create(PasswordStore item);
+    int Edit(uint ID, PasswordStore newItem);
+}