Public Preview: Cognitive Services Form Recognizer v2.1

Form Recognizer v2.1-preview.1 has been released, including the following features: * **REST API reference is available** \- View the [v2.1-preview.1 reference](https://westcentralus.dev.cognitive.microsoft.com/docs/services/form-recognizer-api-v2-1-preview-1/operations/AnalyzeBusinessCardAsync). * **New languages supported** In addition to English, the following languages are now supported: for Layout and Train Custom Model: English (EN), Chinese (Simplified) (ZH-ZH), Dutch (NL), French (FR), German (DE), Italian (IT), Portuguese (PT) and Spanish (ES). * **Checkbox / Selection Mark detection** Form Recognizer supports detection and extraction of selection marks such as check boxes and radio buttons. Selection Marks are extracted in _Layout_ and you can now also label and train in _Train Custom Model - Train with Labels_ to extract key value pairs for selection marks. * **Model Compose** allows multiple models to be composed and called with a single model Id. When a document is submitted to be analyzed with a composed model Id, a classification step is first performed to route it to the correct custom model. Model compose is available for _Train Custom Model - Train with labels._ * **Model name** add a friendly name to your custom models for easier management and tracking. * **New pre-built model for Business Cards** for extracting common fields in English language business cards. * **New locales for pre-built Receipts** in addition to EN-US, support is now available for EN-AU, EN-CA, EN-GB, EN-IN​ * **Quality improvements** for _Layout_, _Train Custom Model_ _\- Train without Labels_, and _Train with Labels_. To learn more and for samples, see the Form Recognizer [What's New](https://docs.microsoft.com/en-us/azure/cognitive-services/form-recognizer/whats-new) page. * Azure Cognitive Services * Features * [ Azure Cognitive Services](https://azure.microsoft.com/en-gb/products/cognitive-services/)