Add minimal 'echo' facebook bot

README.md

@@ -5,4 +5,47 @@
 
 ## Development
 
-    $ npm i
+### 1. Install dependencies
+
+    $ npx yarn
+
+### 2. Set environment variables
+
+#### 2.1.  Generate Facebook Verify Token
+
+    $ export FB_VERIFY_TOKEN=$(tr -dc 'a-zA-Z0-9' < /dev/urandom | fold -w 32 | head -n 1)
+    $ echo Facebook Access Token: $FB_VERIFY_TOKEN
+
+#### 2.2 Set [App Secret][1]
+
+    $ export FB_APP_SECRET=''
+
+#### 2.3. Set [Facebook Access Token][2]
+
+    $ export FB_ACCESS_TOKEN=''
+
+#### 2.4 Set local dev server port
+
+    $ export PORT=3000
+
+### 3. Run the local dev server
+
+    $ npx yarn run dev
+
+### 4. Point ngrok to that local dev server
+
+    $ npx ngrok http $PORT -region eu
+
+### 5. Point the [Facebook webhook][3] to the ngrok tunnel
+
+    https://SOME_RANDOM_ID.ngrok.io/api/v1/facebook/
+
+### 6. Start chatting with your bot
+
+#### 6.1 [Monitor your requests][4]
+
+
+[1]: https://developers.facebook.com/apps/YOUR_APP_ID/settings/basic/
+[2]: https://developers.facebook.com/apps/YOUR_APP_ID/messenger/settings/
+[3]: https://developers.facebook.com/apps/YOUR_APP_ID/webhooks/
+[4]: http://localhost:4040/inspect/http