Refactor(codesigning): migrate to unified folder structure

specification/codesigning/resource-manager/Microsoft.CodeSigning/CodeSigning/readme.md

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+# Artifact Signing
+
+> see https://aka.ms/autorest
+
+This is the AutoRest configuration file for Code Signing service.
+
+## Getting Started
+
+To build the SDKs for Connected Cluster API, simply install AutoRest via `npm` (`npm install -g autorest`) and then run:
+
+> `autorest readme.md`
+
+To see additional help and options, run:
+
+> `autorest --help`
+
+For other options on installation see [Installing AutoRest](https://aka.ms/autorest/install) on the AutoRest github page.
+---
+
+## Configuration
+
+### Basic Information
+
+These are the global settings for the CodeSigning API.
+
+```yaml
+openapi-type: arm
+openapi-subtype: rpaas
+tag: package-2025-10-13
+```
+
+### Tag: package-2026-05-15-preview
+
+These settings apply only when `--tag=package-2026-05-15-preview` is specified on the command line.
+
+```yaml $(tag) == 'package-2026-05-15-preview'
+input-file:
+- preview/2026-05-15-preview/codeSigningAccount.json
+```
+
+### Tag: package-2025-10-13
+
+These settings apply only when `--tag=package-2025-10-13` is specified on the command line.
+
+```yaml $(tag) == 'package-2025-10-13'
+input-file:
+- stable/2025-10-13/codeSigningAccount.json
+```
+
+### Tag: package-2024-09-30-preview
+
+These settings apply only when `--tag=package-2024-09-30-preview` is specified on the command line.
+
+```yaml $(tag) == 'package-2024-09-30-preview'
+input-file:
+- preview/2024-09-30-preview/codeSigningAccount.json
+```
+
+### Tag: package-2024-02-05-preview
+
+These settings apply only when `--tag=package-2024-02-05-preview` is specified on the command line.
+
+```yaml $(tag) == 'package-2024-02-05-preview'
+input-file:
+- preview/2024-02-05-preview/codeSigningAccount.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-python
+  - repo: azure-cli-extensions
+  - repo: azure-sdk-for-net
+  - repo: azure-sdk-for-java
+  - repo: azure-sdk-for-typescript
+```
+
+## Az
+
+See configuration in [readme.az.md](./readme.az.md)
+
+## Python
+
+See configuration in [readme.python.md](./readme.python.md)
+
+## CSharp
+
+See configuration in [readme.csharp.md](./readme.csharp.md)
+
+## Java
+
+See configuration in [readme.java.md](./readme.java.md)
+
+## 
+