docs: improve Readme

Author: maxceem

README.md

@@ -163,6 +163,18 @@
    Runs the Topcoder TaaS API using nodemon, so it would be restarted after any of the files is updated.
    The Topcoder TaaS API will be served on `http://localhost:3000`.
 
+### Working on `taas-es-processor` locally
+
+When you run `taas-apis` locally as per "[Steps to run locally](#steps-to-run-locally)" the `taas-es-processor` would be run for you automatically together with other services inside the docker container when you run `npm run services:up`.
+
+To be able to change and test `taas-es-processor` locally you can follow the next steps:
+
+1. Stop `taas-es-processor` inside docker by running `docker-compose -f local/docker-compose.yml stop taas-es-processor`
+2. Run `taas-es-processor` separately from the [source code](https://github.com/topcoder-platform/taas-es-processor). As `npm run services:up` already run all the dependencies for both `taas-apis` and for `taas-es-processor`. The only thing you need to do for running `taas-es-processor` locally is:
+   - `nvm use` - to use correct Node version
+   - `npm run install`
+   - `npm run start`
+
 ## NPM Commands
 
 | Command                    | Description                                                                                                                                        |