Create README.md

Author: mwbrooks

README.md

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+# Getting Started with ⚡️ Bolt for JavaScript
+> Slack app example from 📚 [Getting started with Bolt for JavaScript tutorial][1]
+
+## Overview
+
+This is a Slack app built with the [Bolt for JavaScript framework][2] that showcases
+responding to events and interactive buttons.
+
+## Running locally
+
+### 1. Setup environment variables
+
+```zsh
+# Replace with your signing secret and token
+export SLACK_APP_BOLT_JS_GETTING_STARTED_SIGNING_SECRET=abcd1234567890123456789012345678
+export SLACK_APP_BOLT_JS_GETTING_STARTED_TOKEN=xoxb-123456789012-123456789012-abcd12345678901234567890
+```
+
+### 2. Setup your local project
+
+```zsh
+# Clone this project onto your machine
+git clone https://github.com/mwbrooks/bolt-js-getting-started-app.git
+
+# Change into the project
+cd bolt-js-getting-started-app/
+
+# Install the dependencies
+npm install
+```
+
+### 3. Start servers
+
+```zsh
+npm run ngrok
+npm run start
+```
+
+[1]: https://slack.dev/bolt-js/tutorial/getting-started
+[2]: https://slack.dev/bolt-js/