feat: impl MCDatabase for mariadb

db/db-sqlx-maria/migrations/20210310122154_mcaptcha_users.sql

@@ -0,0 +1,9 @@
+CREATE TABLE IF NOT EXISTS mcaptcha_users (
+	name VARCHAR(100) NOT NULL UNIQUE,
+	email VARCHAR(100) UNIQUE DEFAULT NULL,
+	email_verified BOOLEAN DEFAULT NULL,
+    secret varchar(50) NOT NULL UNIQUE,
+	password TEXT NOT NULL,
+	ID INT auto_increment,
+	PRIMARY KEY(ID)
+);