Azure Communication Services Chat (Certified Connector) (#1706)

* Azure Communication Services Chat (Certified Connector)

* Add missing operations in README

* address certification comments

* Resolve comments

* Change icon brand color

Author: lei-msft

certified-connectors/Azure Communication Services Chat/README.md

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+# Azure Communication Services Chat
+This Chat Connector can manage users in a chat, create chats threads, and send messages in a chat. [API ref for chat](https://docs.microsoft.com/en-us/rest/api/communication/chat/chat),  [API ref for chat thread](https://docs.microsoft.com/en-us/rest/api/communication/chat/chat-thread). 
+
+## Publisher: Microsoft
+
+## Prerequisites
+You will need the following to proceed:
+* A Microsoft Power Apps or Power Automate plan with custom connector feature
+* An Azure subscription
+* An Azure Communication Services resource
+
+## Supported Operations
+The connector supports the following operations:
+
+### Send Chat
+Send a chat to a specified chat thread given an access token.
+
+### Create Chat
+Create a chat given a chat topic. 
+
+### List Chat Threads
+List all chat threads.
+
+### List Thread Messages
+List Messages From Thread.
+
+### Get Thread Properties
+Get the properties of a chat thread.
+
+### Add Participant
+Add a participant to a chat thread.
+
+### Remove Participant
+Remove a participant from a chat thread.
+
+### List Participants
+List participants in a chat thread.
+
+## Obtaining Credentials
+
+1 Set up an Azure Communication Services resource
+- [Quickstart doc](https://review.docs.microsoft.com/en-us/azure/communication-services/quickstarts/create-communication-resource?branch=pr-en-us-192537&tabs=windows&pivots=platform-azp)
+
+2 Connection String Authentication
+- You can create a new connection using an [Azure Communication Services resource endpoint url](https://docs.microsoft.com/en-us/azure/communication-services/quickstarts/create-communication-resource?tabs=windows&pivots=platform-azp#access-your-connection-strings-and-service-endpoints).
+
+## Known Issues and Limitations
+Does not support Service principal (Azure AD application) Authentication at this time.
+
+## Deployment Instructions
+Run the following commands and follow the prompts:
+```paconn
+paconn create --api-def apiDefinition.swagger.json --api-prop apiProperties.json --script script.csx --icon icon.png
+```