docs: add ec2 instructions to readme

Author: vladgolubev

README.md

@@ -31,6 +31,18 @@ This repo contains code used to run the [online demo](https://vladholubiev.com/s
 
 Compiled and ready to use archive can be downloaded under [Releases section](https://github.com/vladgolubev/serverless-libreoffice/releases).
 
+# How to compile it yourself on EC2
+
+1. Go to [Lambda Execution Environment and Available Libraries](https://docs.aws.amazon.com/lambda/latest/dg/current-supported-versions.html) page to get the latest AMI id
+2.  Click on [this link](https://console.aws.amazon.com/ec2/v2/home#Images:visibility=public-images;search=amzn-ami-hvm-2017.03.1.20170812-x86_64-gp2) to get AMI id for your region
+3. Spin up a `c5.2xlarge` spot instance with ~ 100 GB of storage attached
+4. Follow the steps in `compile.sh` file in the repo
+
+# Help
+
+* [List of RPM Packages available in AWS Lambda](https://gist.github.com/vladgolubev/1dac4ed47a5febf110c668074c6b671c)
+* [List of Libraries available in AWS Lambda](https://gist.github.com/vladgolubev/439559fc7597a4fb51eaa9e97b72f319)
+
 # How To Help
 
 ## Reduce Cold Start Time