Configuring webhooks

Added steps to configure appservice webhooks in the dimension manager.

docs/configuring-playbook-bridge-appservice-webhooks.md

@@ -26,6 +26,8 @@ matrix_appservice_webhooks_log_level: '<log_level>'
 
 3. If you've already installed Matrix services using the playbook before, you'll need to re-run it (`--tags=setup-all,start`). If not, proceed with [configuring other playbook services](configuring-playbook.md) and then with [Installing](installing.md). Get back to this guide once ready.
 
+4. Configure Webhooks bridge by opening the Dimension integration manager -> Settings -> Bridges and select edit action for "Webhook Bridge". Press "Add self-hosted Bridge" button and populate "Provisioning URL"  & "Shared Secret" values from appservice-webhooks/config/config.yaml file's homeserver URL value and provisioning secret value respectively. 
+
 4. Invite the bridge bot user to your room:
 
     - either with `/invite @_webhook:<domain.name>` (*Note*: Make sure you have administration permissions in your room)