add README file for cost management (#3321)

Author: jhendrixMSFT

specification/cost-management/resource-manager/readme.md

@@ -0,0 +1,155 @@
+# CostManagement
+
+> see https://aka.ms/autorest
+
+This is the AutoRest configuration file for Cost Management.
+
+---
+## Getting Started
+To build the SDK for Cost Management, simply [Install AutoRest](https://aka.ms/autorest/install) and in this folder, run:
+
+> `autorest`
+
+To see additional help and options, run:
+
+> `autorest --help`
+---
+
+## Configuration
+
+### Basic Information
+These are the global settings for the Cost Management API.
+
+``` yaml
+openapi-type: arm
+tag: package-2018-05
+```
+
+---
+### Tag: package-2018-05
+
+These settings apply only when `--tag=package-2018-05` is specified on the command line.
+
+``` yaml $(tag) == 'package-2018-05'
+input-file:
+- Microsoft.CostManagement/stable/2018-05-31/costmanagement.json
+```
+
+---
+# Code Generation
+
+## Swagger to SDK
+
+This section describes what SDK should be generated by the automatic system.
+This is not used by Autorest itself.
+
+``` yaml $(swagger-to-sdk)
+swagger-to-sdk:
+  - repo: azure-sdk-for-go
+  - repo: azure-sdk-for-python
+  - repo: azure-sdk-for-node
+  - repo: azure-sdk-for-ruby
+    after_scripts:
+      - bundle install && rake arm:regen_all_profiles['azure_mgmt_costmanagement']
+```
+
+## C#
+
+These settings apply only when `--csharp` is specified on the command line.
+Please also specify `--csharp-sdks-folder=<path to "SDKs" directory of your azure-sdk-for-net clone>`.
+
+``` yaml $(csharp)
+csharp:
+  azure-arm: true
+  license-header: MICROSOFT_MIT_NO_VERSION
+  namespace: Microsoft.Azure.Management.CostManagement
+  output-folder: $(csharp-sdks-folder)/CostManagement/Management.CostManagement/Generated
+  clear-output-folder: true
+```
+
+## Python
+
+These settings apply only when `--python` is specified on the command line.
+Please also specify `--python-sdks-folder=<path to the root directory of your azure-sdk-for-python clone>`.
+Use `--python-mode=update` if you already have a setup.py and just want to update the code itself.
+
+``` yaml $(python)
+python-mode: create
+python:
+  azure-arm: true
+  license-header: MICROSOFT_MIT_NO_VERSION
+  payload-flattening-threshold: 2
+  namespace: azure.mgmt.costmanagement
+  package-name: azure-mgmt-costmanagement
+  package-version: 1.2.0
+  clear-output-folder: true
+```
+``` yaml $(python) && $(python-mode) == 'update'
+python:
+  no-namespace-folders: true
+  output-folder: $(python-sdks-folder)/azure-mgmt-costmanagement/azure/mgmt/costmanagement
+```
+``` yaml $(python) && $(python-mode) == 'create'
+python:
+  basic-setup-py: true
+  output-folder: $(python-sdks-folder)/azure-mgmt-costmanagement
+```
+
+## Go
+
+These settings apply only when `--go` is specified on the command line.
+
+``` yaml $(go)
+go:
+  license-header: MICROSOFT_APACHE_NO_VERSION
+  namespace: costmanagement
+  clear-output-folder: true
+```
+
+### Go multi-api
+``` yaml $(go) && $(multiapi)
+batch:
+   - tag: package-2018-05
+```
+
+### Tag: package-2018-05 and go
+These settings apply only when `--tag=package-2018-05 --go` is specified on the command line.
+Please also specify `--go-sdk-folder=<path to the root directory of your azure-sdk-for-go clone>`.
+
+``` yaml $(tag) == 'package-2018-05' && $(go)
+output-folder: $(go-sdk-folder)/services/$(namespace)/mgmt/2018-05-31/$(namespace)
+```
+
+## Java
+
+These settings apply only when `--java` is specified on the command line.
+Please also specify `--azure-libraries-for-java-folder=<path to the root directory of your azure-libraries-for-java clone>`.
+
+``` yaml $(java)
+azure-arm: true
+fluent: true
+namespace: com.microsoft.azure.management.costmanagement
+license-header: MICROSOFT_MIT_NO_CODEGEN
+payload-flattening-threshold: 1
+output-folder: $(azure-libraries-for-java-folder)/azure-mgmt-costmanagement
+```
+
+### Java multi-api
+
+``` yaml $(java) && $(multiapi)
+batch:
+  - tag: package-2018-05
+```
+
+### Tag: package-2018-05 and java
+
+These settings apply only when `--tag=package-2018-05 --java` is specified on the command line.
+Please also specify `--azure-libraries-for-java=<path to the root directory of your azure-sdk-for-java clone>`.
+
+``` yaml $(tag) == 'package-2018-05' && $(java) && $(multiapi)
+java:
+  namespace: com.microsoft.azure.management.costmanagement.v2018_05_31
+  output-folder: $(azure-libraries-for-java-folder)/costmanagement/resource-manager/v2018_05_31
+regenerate-manager: true
+generate-interface: true
+```