feat(dao): add initial data access object templates

src/main/java/dev/dao/UserDao.java

@@ -0,0 +1,23 @@
+package dev.dao;
+
+import dev.model.User;
+
+public class UserDao {
+
+    public boolean save(User user) {
+
+        // TODO:
+        // Insert user into database
+
+        return false;
+    }
+
+    public User findByUsername(String username) {
+
+        // TODO:
+        // Find a user by username
+
+        return null;
+    }
+
+}