chore(#25): Update README with local testing flow

[Phil-Mwago]

Description

Update README with local testing flow

medic/interoperability#25

Code review checklist

• [ ] Readable: Concise, well named, follows the style guide, documented if necessary.
• [ ] Documented: Configuration and user documentation on cht-docs
• [ ] Tested: Unit and/or e2e where appropriate
• [ ] Backwards compatible: Works with existing data and configuration or includes a migration. Any breaking changes documented in the release notes.

License

The software is provided under AGPL-3.0. Contributions to this project are accepted under the same license.

[andrablaj]

@Phil-Mwago I will add some clarification directly in a commit. This is an exception, as we are on a tight timeline to merge this.

[andrablaj]

@Phil-Mwago I changed the style to make the text more readable and added screenshots. As a tip, I usually use this CheatSheet to see the style options; I never remember them by heart. 😅

[Phil-Mwago]

Thanks @andrablaj this is well noted and thanks for the tip.