Create azure_cosmos_db in ecosystems.md (#2371)

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Author: wmwxwa

website/docs/ecosystem/azure_cosmos_db.md

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+# Azure Cosmos DB
+
+> "OpenAI relies on Cosmos DB to dynamically scale their ChatGPT service – one of the fastest-growing consumer apps ever – enabling high reliability and low maintenance."
+> – Satya Nadella, Microsoft chairman and chief executive officer
+
+Azure Cosmos DB is a fully managed [NoSQL](https://learn.microsoft.com/en-us/azure/cosmos-db/distributed-nosql), [relational](https://learn.microsoft.com/en-us/azure/cosmos-db/distributed-relational), and [vector database](https://learn.microsoft.com/azure/cosmos-db/vector-database). It offers single-digit millisecond response times, automatic and instant scalability, along with guaranteed speed at any scale. Your business continuity is assured with up to 99.999% availability backed by SLA.
+
+Your can simplify your application development by using this single database service for all your AI agent memory system needs, from [geo-replicated distributed cache](https://medium.com/@marcodesanctis2/using-azure-cosmos-db-as-your-persistent-geo-replicated-distributed-cache-b381ad80f8a0) to tracing/logging to [vector database](https://learn.microsoft.com/en-us/azure/cosmos-db/vector-database).
+
+Learn more about how Azure Cosmos DB enhances the performance of your [AI agents](https://learn.microsoft.com/en-us/azure/cosmos-db/ai-agents).
+
+- [Try Azure Cosmos DB free](https://learn.microsoft.com/en-us/azure/cosmos-db/try-free)
+- [Use Azure Cosmos DB lifetime free tier](https://learn.microsoft.com/en-us/azure/cosmos-db/free-tier)