docs: add commands for setup and testing examples for maintainers (#17)

Author: zimeg

.github/MAINTAINERS_GUIDE.md

@@ -0,0 +1,63 @@
+# Maintainers Guide
+
+Let's hope to have matching examples of documentation and reference for various runtimes be consistent!
+
+- **[Development](#development)**: Making changes alongside the Node Slack SDK.
+- **[Commands](#commands)**: Reference to running example code of this project.
+- **[Structure](#structure)**: Adding examples for features of the Slack Platform.
+
+## Development
+
+Bringing ongoing changes from the [Python Slack SDK](https://github.com/slackapi/python-slack-sdk) requires building from source with these commands:
+
+```sh
+$ git clone git@github.com:slackapi/python-slack-sdk.git
+$ cd python-slack-sdk
+$ python -m venv .venv
+$ source .venv/bin/activate
+(.venv) $ ./scripts/build_pypi_package.sh
+```
+
+This bundles a compilation as a `slack_sdk-*-py2.py3-none-any.whl` file that is used to replace previous installations:
+
+```sh
+$ git clone git@github.com:slack-samples/bolt-python-examples.git
+$ cd bolt-python-examples
+$ cd block-kit       # Navigate to an example to change
+$ python -m venv .venv
+$ source .venv/bin/activate
+(.venv) $ pip install -r requirements.txt
+(.venv) $ pip install /path/to/python-slack-sdk/dist/slack_sdk-*-py2.py3-none-any.whl --force-reinstall
+```
+
+## Commands
+
+Each example has matching commands to run tests:
+
+```sh
+$ ruff check
+$ ruff format --diff --check
+$ mypy ./**/*.py
+$ pytest -v
+```
+
+## Structure
+
+New code snippets or samples added should match the structure of the [docs.slack.dev](https://docs.slack.dev) site:
+
+```txt
+|- .github
+   |- dependabot.yml  # https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/controlling-dependencies-updated#defining-multiple-locations-for-manifest-files
+|- block-kit
+   |- blocks          # https://docs.slack.dev/reference/block-kit/blocks
+   |- formatting      # https://docs.slack.dev/block-kit/formatting-with-rich-text
+|- messaging
+   |- sending         # https://docs.slack.dev/messaging/sending-and-scheduling-messages
+   |- work-objects    # https://docs.slack.dev/messaging/work-objects
+```
+
+Some pages might reference distinct examples needing unique app manifests. These should appear in separate nested directories for a minimal demonstration.
+
+Certain features or demonstrations might not have a clear example on the docs site. Discussions with the kind documentation team ought be started if so! We hope folks find relevant examples through those pages.
+
+A goal of this project is to be a source of tested reference.