add aws cost explorer MCP server to the community server list

Author: aarora79

README.md

@@ -77,6 +77,7 @@ A growing set of community-developed and maintained servers demonstrates various
 
 > **Note:** Community servers are **untested** and should be used at **your own risk**. They are not affiliated with or endorsed by Anthropic.
 
+- **[AWS Cost Explorer](https://github.com/aarora79/aws-cost-explorer-mcp-server)** - Optimize your AWS spend by with this MCP server by examining spend across regions, services and instance types ([demo video](https://www.youtube.com/watch?v=WuVOmYLRFmI&feature=youtu.be)).
 - **[AWS S3](https://github.com/aws-samples/sample-mcp-server-s3)** - A sample MCP server for AWS S3 that flexibly fetches objects from S3 such as PDF documents
 - **[AWS](https://github.com/rishikavikondala/mcp-server-aws)** - Perform operations on your AWS resources using an LLM
 - **[Airtable](https://github.com/domdomegg/airtable-mcp-server)** - Read and write access to [Airtable](https://airtable.com/) databases, with schema inspection.