message: mysql readme update for typescript
diff: @@ -11,3 +11,24 @@ typescript:
  clear-output-folder: true
  generate-metadata: true
  ```
  +
  +### Tag: package-flexibleserver-2021-05-01 and TypeScript
  +
  +These settings apply only when `--tag=package-flexibleserver-2021-05-01 --typescript` is specified on the command line.
  +Please also specify `--typescript-sdks-folder=<path to the root directory of your azure-sdk-for-typescript clone>`.
  +
  +``` yaml $(tag) == 'package-flexibleserver-2021-05-01' && $(typescript)
  +title: MySQLManagementFlexibleServerClient
  +package-name: "@azure/arm-mysql-flexible"
  +output-folder: "$(typescript-sdks-folder)/sdk/mysql/arm-mysql-flexible/"
  +```
  +
  +### Tag: package-2020-01-01 and TypeScript
  +
  +These settings apply only when `--tag=package-2020-01-01 --typescript` is specified on the command line.
  +Please also specify `--typescript-sdks-folder=<path to the root directory of your azure-sdk-for-typescript clone>`.
  +
  +``` yaml $(tag) == 'package-2020-01-01' && $(typescript)
  +package-name: "@azure/arm-mysql"
  +output-folder: "$(typescript-sdks-folder)/sdk/mysql/arm-mysql/"
  +```
  