Setup sql seed and migrations

Author: svarlamov

migrations/1_init.down.sql

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+DROP TABLE `gopher`;

migrations/1_init.up.sql

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+CREATE TABLE `gopher` (
+	`id` INT UNSIGNED AUTO_INCREMENT,
+    `full_name` VARCHAR(255) NOT NULL,
+    `headline` VARCHAR(255) NOT NULL,
+    `avatar_url` VARCHAR(255) NOT NULL,
+	`created_at` DATETIME NOT NULL,
+	`updated_at` DATETIME NOT NULL,
+    PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+

seed/1_seed.down.sql

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+DELETE FROM `gopher` WHERE id IN (1, 2, 3);

seed/1_seed.up.sql

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+INSERT INTO `gopher` (`id`, `full_name`, `headline`, `avatar_url`, `created_at`, `updated_at`)
+	VALUES (1, "Sasha Varlamov", "CEO @EXLskills", "https://s3-us-west-2.amazonaws.com/exlskills-instructor-profiles/svarlamov.jpg", NOW(), NOW());
+INSERT INTO `gopher` (`id`, `full_name`, `headline`, `avatar_url`, `created_at`, `updated_at`)
+        VALUES (2, "Elliott Saslow", "Python @EXLskills", "https://s3-us-west-2.amazonaws.com/exlskills-instructor-profiles/swelliott.jpg", NOW(), NOW());
+INSERT INTO `gopher` (`id`, `full_name`, `headline`, `avatar_url`, `created_at`, `updated_at`)
+        VALUES (3, "Keenan Olsen", "SQL @EXLskills", "https://s3-us-west-2.amazonaws.com/exlskills-instructor-profiles/keeno12.jpeg", NOW(), NOW());
+