[PostgreSQL] Update readme.typescript.md file to release SDK for Post…

…greSQL flexible server (Azure#14532)

* multi api for typescript

* fix typo

* update multiapi

* js md file added title

* Removing multi api support for typescript

* Update specification/postgresql/resource-manager/readme.typescript.md

Co-authored-by: Wei Dong <40835867+dw511214992@users.noreply.github.com>

* Update specification/postgresql/resource-manager/readme.typescript.md

Co-authored-by: Wei Dong <40835867+dw511214992@users.noreply.github.com>

* Update specification/postgresql/resource-manager/readme.typescript.md

Co-authored-by: Wei Dong <40835867+dw511214992@users.noreply.github.com>

* Update package name

* Change API version

* remove API change

Co-authored-by: Wei Dong <40835867+dw511214992@users.noreply.github.com>

specification/postgresql/resource-manager/readme.md

@@ -30,6 +30,7 @@ description: The Microsoft Azure management API provides create, read, update, a
 openapi-type: arm
 tag: package-2020-01-01
 ```
+
 ### Tag: package-2021-06-01
 
 These settings apply only when `--tag=package-2021-06-01` is specified on the command line.
@@ -238,6 +239,10 @@ See configuration in [readme.go.md](./readme.go.md)
 
 See configuration in [readme.java.md](./readme.java.md)
 
+## TypeScript
+
+See configuration in [readme.typescript.md](./readme.typescript.md)
+
 
 
 ## Multi-API/Profile support for AutoRest v3 generators

specification/postgresql/resource-manager/readme.typescript.md

@@ -6,8 +6,27 @@ Please also specify `--typescript-sdks-folder=<path to root folder of your azure
 ``` yaml $(typescript)
 typescript:
   azure-arm: true
-  package-name: "@azure/arm-postgresql"
-  output-folder: "$(typescript-sdks-folder)/sdk/postgresql/arm-postgresql"
   clear-output-folder: true
   generate-metadata: true
 ```
+
+### Tag: package-2021-04-10-privatepreview and TypeScript
+
+These settings apply only when `--tag=package-2021-04-10-privatepreview --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-2021-04-10-privatepreview' && $(typescript)
+title: PostgreSQLManagementFlexibleServerClient
+package-name: "@azure/arm-postgresql-flexible"
+output-folder: "$(typescript-sdks-folder)/sdk/postgresql/arm-postgresql-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' && $(typescript)
+package-name: "@azure/arm-postgresql"
+output-folder: "$(typescript-sdks-folder)/sdk/postgresql/arm-postgresql/"
+```