Update schema to include default contents sql file.

database/default-content-example.sql

@@ -0,0 +1,15 @@
+INSERT INTO users (username, email, password) VALUES 
+    ('someUsername', 'some@email.com', 'passwordHash');
+
+INSERT INTO permissions (user_id, permission) VALUES 
+    (1, 'admin');
+
+INSERT INTO accounts (account_id) VALUES ("<some account id value>");
+
+INSERT INTO user_accounts (user_id, account_id) VALUES (1,"<match account id above>");
+
+INSERT INTO tasks (user_id, task, description, status, external_url) VALUES 
+    (1, 'Buy milk', 'this task requires you to go to the store and buy milk.', 'pending', 'https://www.google.com');
+
+INSERT INTO tasks (user_id, task, description, status, external_url) VALUES 
+    (1, 'Buy eggs', 'this task requires you to go to the store and buy eggs.', 'pending', 'https://www.google.com');