Added top level README for cosmos SDK (Azure#19457)

* Added top level README for cosmos SDK

* Skipping cosmos top level readme from build analyze step

Author: kushagraThapar

eng/.docsettings.yml

@@ -134,6 +134,7 @@ known_content_issues:
   - ['sdk/cosmos/azure-cosmos-examples/README.md', '#3113']
   - ['sdk/cosmos/azure-cosmos/README.md', '#3113']
   - ['sdk/cosmos/azure-cosmos-encryption/README.md', '#3113']
+  - ['sdk/cosmos/README.md', '#3113']
   - ['sdk/e2e/README.md', '#3113']
   - ['sdk/eventgrid/azure-messaging-eventgrid/swagger/README.md', '#3113']
   - ['sdk/eventgrid/microsoft-azure-eventgrid/README.md', '#3113']

sdk/cosmos/README.md

@@ -0,0 +1,22 @@
+# Azure CosmosDB Client library for Java
+
+[![Build Status](https://dev.azure.com/azure-sdk/public/_apis/build/status/17?branchName=master)](https://dev.azure.com/azure-sdk/public/_build/latest?definitionId=17) [![Build Documentation](https://img.shields.io/badge/documentation-published-blue.svg)](https://azuresdkartifacts.blob.core.windows.net/azure-sdk-for-java/index.html) [![Dependencies](https://img.shields.io/badge/dependencies-analyzed-blue.svg)](https://azuresdkartifacts.blob.core.windows.net/azure-sdk-for-java/staging/dependencies.html) [![SpotBugs](https://img.shields.io/badge/SpotBugs-Clean-success.svg)](https://azuresdkartifacts.blob.core.windows.net/azure-sdk-for-java/staging/spotbugsXml.html) [![CheckStyle](https://img.shields.io/badge/CheckStyle-Clean-success.svg)](https://azuresdkartifacts.blob.core.windows.net/azure-sdk-for-java/staging/checkstyle-aggregate.html)
+
+Azure Cosmos DB is Microsoft’s globally distributed, multi-model database service for operational and analytics workloads. It offers multi-mastering feature by automatically scaling throughput, compute, and storage.
+This project provides SDK library in Java for interacting with [SQL API][sql_api_query] of [Azure Cosmos DB Database Service][cosmos_introduction].
+
+## Getting started
+
+To get started with a specific library, see the **README.md** file located in the library's project folder. You can find service libraries in the `/sdk/cosmos/` directory.
+- [Azure Cosmos](https://github.com/Azure/azure-sdk-for-java/blob/master/sdk/cosmos/azure-cosmos/README.md) is Microsoft's Azure Cosmos DB Java SDK which provides client-side logical representation to access the Azure Cosmos DB SQL API. The SDK provides Reactor Core based async APIs.
+- [Azure Spring Data Cosmos](https://github.com/Azure/azure-sdk-for-java/blob/master/sdk/cosmos/azure-spring-data-cosmos/README.md) provides Spring Data support for Azure Cosmos DB using the SQL API, based on Spring Data framework.
+- [Azure Cosmos Encryption](https://github.com/Azure/azure-sdk-for-java/blob/master/sdk/cosmos/azure-cosmos-encryption/README.md) supports encryption for Azure Cosmos DB using SQL API. This plugin library is still under development and not is not ready to be consumed yet. 
+- [Azure Cosmos Benchmark](https://github.com/Azure/azure-sdk-for-java/blob/master/sdk/cosmos/azure-cosmos-benchmark/README.md) is the benchmarking tool which provides different kinds of benchmarking workloads including but not limited to `readLatency`, `readThroughput`, `writeThroughput`, `readMyWrites`, etc.
+- [Azure Cosmos DotNet Benchmark](https://github.com/Azure/azure-sdk-for-java/blob/master/sdk/cosmos/azure-cosmos-dotnet-benchmark/README.md) is the port of CosmosDB .NET benchmarking tool. 
+- [Azure Cosmos Examples](https://github.com/Azure/azure-sdk-for-java/blob/master/sdk/cosmos/azure-cosmos-examples/README.md) provides various examples / samples on how to use Azure Cosmos DB SDK for SQL API.
+
+<!-- LINKS -->
+[sql_api_query]: https://docs.microsoft.com/azure/cosmos-db/sql-api-sql-query
+[cosmos_introduction]: https://docs.microsoft.com/azure/cosmos-db/
+
+![Impressions](https://azure-sdk-impressions.azurewebsites.net/api/impressions/azure-sdk-for-java%2Fsdk%2Fcosmos%2Fazure-cosmos%2FREADME.png)