Add gridscale_mysql resource example

See also gridscale/terraform-provider-gridscale#166

mysql/README.md

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+# MySQL Example
+
+This example shows how you can manage a MySQL with Terraform using the `"gridscale_mysql"` resource.
+
+Before you run Terraform, you need to set the `GRIDSCALE_TOKEN` and `GRIDSCALE_UUID` environment variables to their appropriate values. Take a look at the `.envrc` file for all variables.
+
+## Example
+
+In this example we will provision 2 MySQL resources:
+- The first one is a simple MySQL resource without any MySQL parameters.
+- The second one is a MySQL resourece with some MySQL parameters.

mysql/mysql.tf

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+terraform {
+  required_providers {
+    gridscale = {
+      source  = "gridscale/gridscale"
+      version = "~> 1.11.0"
+    }
+  }
+}
+
+resource "gridscale_mysql" "my-mysql" {
+    name = "my new mysql"
+	release = "5.7"
+	performance_class = "insane"
+}
+
+resource "gridscale_mysql" "mysql-with-params" {
+	name = "my mysql with params"
+	release = "10.5"
+	performance_class = "insane"
+	labels = ["test"]
+	mysql_query_cache_limit = "2M"
+	mysql_default_time_zone = "Europe/Berlin"
+	mysql_server_id = 2
+	mysql_binlog_format = "MIXED"
+}