docs(mysql): add usage and configuration instructions

Databases/mysql/.gitignore

@@ -0,0 +1 @@
+.env

Databases/mysql/README.md

@@ -0,0 +1,52 @@
+# MYSQL
+
+Documentação do MySQL
+
+[https://dev.mysql.com/doc/](https://dev.mysql.com/doc/)
+
+Docker Image
+
+[mysql](https://hub.docker.com/_/mysql)
+
+[quay.io/prometheus/mysqld-exporter](https://quay.io/repository/prometheus/mysqld-exporter?tab=info)
+
+## Usage
+
+Crie o arquivo .env.
+
+```bash
+cp .env.example .env
+```
+
+```dotenv
+MYSQL_ROOT_PASSWORD=
+
+MYSQL_EXPORTER_USER=exporter
+MYSQL_EXPORTER_PASSWORD=
+```
+
+Crie o arquivo conf/init.sql
+
+```bash
+cp conf/init.sql.example conf/init.sql
+```
+
+Lembre de ajustar a senha igual ao do arquivo .env.
+
+## Comands
+
+```bash
+docker compose build
+```
+
+```bash
+docker compose up -d
+```
+
+```bash
+docker compose down
+```
+
+```bash
+docker compose rm
+```

Databases/mysql/conf/.gitignore

@@ -0,0 +1,2 @@
+init.sql
+!.gitignore

Databases/mysql/conf/my.cnf → Databases/mysql/conf/conf-my.cnf

@@ -6,4 +6,4 @@ collation-server=utf8mb4_unicode_ci
 slow_query_log=1
 long_query_time=1
 log_output=FILE
-max_connections=200
+max_connections=400

Databases/mysql/conf/init.sql → Databases/mysql/conf/init.sql.example

@@ -1,3 +1,3 @@
-CREATE USER IF NOT EXISTS 'exporter'@'%' IDENTIFIED BY 'youpassworduserexporter';
+CREATE USER IF NOT EXISTS 'exporter'@'%' IDENTIFIED BY 'MYSQL_EXPORTER_PASSWORD';
 GRANT PROCESS, REPLICATION CLIENT, SELECT ON *.* TO 'exporter'@'%';
 FLUSH PRIVILEGES;