Create README.md

Author: ErickWendel

README.md

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+# Parallelizing Node.js operations with child process
+
+Example of how Migrate 1M items from MongoDB to Postgres in just a few minutes using Node.js child process
+
+![Aumentando em 999x a velocidade de processamento de dados com Node](https://github.com/ErickWendel/parallelizing-nodejs-ops/assets/8060102/6974de93-7848-477a-9198-9d99dedc18f3)
+
+
+## Running
+
+You'll need to install Docker and Docker compose to be able to spin up the DBs instances, after that run:
+- docker-compose up -d
+- npm ci
+- npm run seed
+- npm start
+
+## Errors?
+
+In case you got an error of too many processes open, try decreasing the const [CLUSTER_SIZE](https://github.com/ErickWendel/parallelizing-nodejs-ops/blob/main/src/index.js#L8C1-L8C24) variable