docs: add Slack CLI setup instructions to README.md (#80)

Author: srtaalej

README.md

@@ -2,57 +2,113 @@
 
 This is a generic Bolt for Python template app used to build out Slack apps.
 
-Before getting started, make sure you have a development workspace where you have permissions to install apps. If you don’t have one setup, go ahead and [create one](https://slack.com/create).
+## Setup
+
+Before getting started, make sure you have a development workspace where you have permissions to install apps. If you don't have one setup, go ahead and [create one](https://slack.com/create).
+
+### Developer Program
+
+Join the [Slack Developer Program](https://api.slack.com/developer-program) for exclusive access to sandbox environments for building and testing your apps, tooling, and resources created to help you build and grow.
+
 ## Installation
 
-#### Create a Slack App
+<details><summary><strong>Using Slack CLI</strong></summary>
+
+Install the latest version of the Slack CLI for your operating system:
+
+- [Slack CLI for macOS & Linux](https://docs.slack.dev/tools/slack-cli/guides/installing-the-slack-cli-for-mac-and-linux/)
+- [Slack CLI for Windows](https://docs.slack.dev/tools/slack-cli/guides/installing-the-slack-cli-for-windows/)
+
+You'll also need to log in if this is your first time using the Slack CLI.
+
+```sh
+slack login
+```
+
+#### Initializing the project
+
+```sh
+slack create my-bolt-python-app --template slack-samples/bolt-python-starter-template
+cd my-bolt-python-app
+```
+
+After cloning, you're all set to start developing!
+
+</details>
+
+<details><summary><strong>Using Terminal</strong></summary>
+
+#### Create Your Slack App
+
 1. Open [https://api.slack.com/apps/new](https://api.slack.com/apps/new) and choose "From an app manifest"
 2. Choose the workspace you want to install the application to
 3. Copy the contents of [manifest.json](./manifest.json) into the text box that says `*Paste your manifest code here*` (within the JSON tab) and click *Next*
 4. Review the configuration and click *Create*
 5. Click *Install to Workspace* and *Allow* on the screen that follows. You'll then be redirected to the App Configuration dashboard.
 
 #### Environment Variables
+
 Before you can run the app, you'll need to store some environment variables.
 
-1. Open your apps configuration page from this list, click **OAuth & Permissions** in the left hand menu, then copy the Bot User OAuth Token. You will store this in your environment as `SLACK_BOT_TOKEN`.
-2. Click ***Basic Information** from the left hand menu and follow the steps in the App-Level Tokens section to create an app-level token with the `connections:write` scope. Copy this token. You will store this in your environment as `SLACK_APP_TOKEN`.
+1. Open your apps configuration page from [this list](https://api.slack.com/apps), click **OAuth & Permissions** in the left hand menu, then copy the Bot User OAuth Token. You will store this in your environment as `SLACK_BOT_TOKEN`.
+2. Click **Basic Information** from the left hand menu and follow the steps in the App-Level Tokens section to create an app-level token with the `connections:write` scope. Copy this token. You will store this in your environment as `SLACK_APP_TOKEN`.
 
 ```zsh
 # Replace with your app token and bot token
 export SLACK_BOT_TOKEN=<your-bot-token>
 export SLACK_APP_TOKEN=<your-app-token>
 ```
 
-### Setup Your Local Project
-```zsh
-# Clone this project onto your machine
-git clone https://github.com/slack-samples/bolt-python-starter-template.git
+#### Initializing the project
+
+```sh
+git clone https://github.com/slack-samples/bolt-python-starter-template.git my-bolt-python-app
+cd my-bolt-python-app
+```
 
-# Change into this project directory
-cd bolt-python-starter-template
+#### Setup your python virtual environment
 
-# Setup your python virtual environment
+```sh
 python3 -m venv .venv
-source .venv/bin/activate
+source .venv/bin/activate  # for Windows OS, .\.venv\Scripts\Activate instead should work
+```
+
+#### Install dependencies
 
-# Install the dependencies
+```sh
 pip install -r requirements.txt
+```
+
+</details>
 
-# Start your local server
+## Development
+
+### Starting the app
+
+#### Slack CLI
+
+```sh
+slack run
+```
+
+#### Terminal
+
+```sh
 python3 app.py
 ```
 
-#### Linting
+### Linting
+
 ```zsh
 # Run ruff from root directory for linting
-ruff check .
+ruff check
 
 # Run ruff from root directory for code formatting
-ruff format .
+ruff format
 ```
 
-#### Testing
+### Testing
+
 ```zsh
 # Run pytest from root directory for unit testing
 pytest .
@@ -70,15 +126,15 @@ pytest .
 
 ### `/listeners`
 
-Every incoming request is routed to a "listener". Inside this directory, we group each listener based on the Slack Platform feature used, so `/listeners/shortcuts` handles incoming [Shortcuts](https://api.slack.com/interactivity/shortcuts) requests, `/listeners/views` handles [View submissions](https://api.slack.com/reference/interaction-payloads/views#view_submission) and so on.
+Every incoming request is routed to a "listener". Inside this directory, we group each listener based on the Slack Platform feature used, so `/listeners/shortcuts` handles incoming [Shortcuts](https://docs.slack.dev/interactivity/implementing-shortcuts/) requests, `/listeners/views` handles [View submissions](https://api.slack.com/reference/interaction-payloads/views#view_submission) and so on.
 
 ## App Distribution / OAuth
 
 Only implement OAuth if you plan to distribute your application across multiple workspaces. A separate `app_oauth.py` file can be found with relevant OAuth settings.
 
 When using OAuth, Slack requires a public URL where it can send requests. In this template app, we've used [`ngrok`](https://ngrok.com/download). Checkout [this guide](https://ngrok.com/docs#getting-started-expose) for setting it up.
 
-Start `ngrok` to access the app on an external network and create a redirect URL for OAuth. 
+Start `ngrok` to access the app on an external network and create a redirect URL for OAuth.
 
 ```
 ngrok http 3000