Add Basic Auth to Signal Messenger

source/_integrations/signal_messenger.markdown

@@ -63,6 +63,19 @@ url:
   description: The URL where the Signal Messenger REST API listens for incoming requests. 
   required: true
   type: string
+auth:
+  description: Configuration for Basic Auth.
+  required: false
+  type: map
+  keys:
+    username:
+      description: Username for authentication.
+      required: true
+      type: string
+    password:
+      description: Password for authentication.
+      required: true
+      type: string
 number:
   description: The sender number.
   required: true
@@ -75,6 +88,23 @@ recipients:
     type: string
 {% endconfiguration %}
 
+### Basic Auth
+
+If Signal Messenger is running behind a Proxy with Basic Auth requirements, you need to add `auth` to your config and specify the username and password respectively.
+
+```yaml
+# Basic Auth example for Signal Messenger
+notify:
+  - name: signal
+    platform: signal_messenger
+    url: "http://127.0.0.1:8080"
+    auth:
+      username: "BASIC_AUTH_USERNAME" # the username to be used for Basic Auth
+      password: "BASIC_AUTH_PASSWORD" # the password for the specified user
+    number: "YOUR_PHONE_NUMBER"
+    recipients:
+      - "RECIPIENT1"
+```
 
 ## Notification action