add docs

Author: aabedraba

packages/README.md

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+# RMW Packages
+
+### How to develop
+
+To start developing any of the three `base-shell`, `material-ui-shell` or `rmw-shell` packages, you can go to any of the package directories and run:
+
+```
+npm run dev
+```
+
+You can then work on the `src/` folder or the `create-[package]-shell/template` folder to make changes. The `src/` folder contains the package logic, and the `template/` contains an App website to be displayed in the browser.
+
+The `template` folder is also used for creating templates that are used to bootstrap new projects, like `npm create @ecronix/base-shell@latest`.
+
+### Building and publishing the project
+
+You can build a single package by running `npm run build`, update the version in the `package.json` file, and then publish it to npm by running `npm publish`.
+
+But you should do this using Lerna, which will update the version of all packages, build them, and publish them to npm. To do this, run:
+
+```
+npx lerna version --since master
+npx lerna run build --since master
+npx lerna publish from-package
+```
+
+Usually these commands are run by the CI/CD pipeline, but you can run them locally if you want to test them.
+
+#### Notes
+
+- The `--since master` flag is used to only update the packages that have changed since the last commit on the `master` branch.
+
+- When running `npx lerna publish from-package`, **DO NOT** commit the changes to the `package.json` files where the `gitHead` section is added. Remove all these changes by running:
+
+```
+git checkout -- .
+```
+
+### Testing templates
+
+To test how the template is used in a new project, you can run:
+
+```
+npx create @ecronix/[package]-shell@latest
+```
+
+Do not do this if you want to change the visual appearance of the template. Instead, you should work on the `packages/[package]` folder directly as described in the first section.