Add readme.

Author: artema

README.md

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+# AWS Lambda performance benchmark
+
+Runs basic [Express](https://www.npmjs.com/package/express) and [Sharp](https://www.npmjs.com/package/sharp) benchmarks on AWS Lambda on x86-64 and ARM64 functions of various sizes.
+
+## Requirements
+
+* Node.js
+* Docker
+* AWS CLI
+* Pulumi
+
+## Setup
+
+1. `npm i && cd docker && npm i && cd ..`
+2. `pulumi up -y`
+3. `npm run docker`
+4. Go to the AWS Lambda console and run `lambda-benchmarks-main-runner` function.
+
+## Credits
+
+Photo by [Errin Casano]([https://www.pexels.com/@errin-casano-1240439?utm_content=attributionCopyText&utm_medium=referral&utm_source=pexels) from [Pexels](https://www.pexels.com/photo/rocky-mountains-under-blue-sky-2356059/?utm_content=attributionCopyText&utm_medium=referral&utm_source=pexels)