DRAFT: added readme on how to start many chains

[mm-zk]

Summary

Docs on how to start many chains with custom era-contracts

[github-actions]

Hey there! 👋🏼

We require pull request titles to follow the Conventional Commits specification and it looks like your proposed title needs to be adjusted.
Examples of valid PR titles:

• feat(eth_sender): Support new transaction type
• fix(state_keeper): Correctly handle edge case
• ci: Add new workflow for linting

Details:

Unknown release type "DRAFT" found in pull request title "DRAFT: added readme on how to start many chains". 

Available types:
 - feat: A new feature
 - fix: A bug fix
 - docs: Documentation only changes
 - style: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)
 - refactor: A code change that neither fixes a bug nor adds a feature
 - perf: A code change that improves performance
 - test: Adding missing tests or correcting existing tests
 - build: Changes that affect the build system or external dependencies (example scopes: gulp, broccoli, npm)
 - ci: Changes to our CI configuration files and scripts (example scopes: Travis, Circle, BrowserStack, SauceLabs)
 - chore: Other changes that don't modify src or test files
 - revert: Reverts a previous commit

[github-actions]

Test results

164 tests   164 ✅  12m 40s ⏱️
 23 suites    0 💤
  1 files      0 ❌

Results for commit bb711a6.