Add TMB sensor documentation (#10905)

* Add TMB sensor resources

* ✏️ Tweaks

Co-authored-by: Franck Nijhof <frenck@frenck.nl>

source/_integrations/tmb.markdown

@@ -0,0 +1,57 @@
+---
+title: "Transports Metropolitans de Barcelona"
+description: "Instructions on how to integrate TMB iBus sensor within Home Assistant."
+logo: tmb.png
+ha_category:
+  - Transport
+ha_release: 0.104
+ha_iot_class: Local Polling
+---
+
+This sensor will provide you the remaining time, in minutes, for the next bus in a specific stop by using the [iBus service](https://www.tmb.cat/en/barcelona/tmb-ibus).
+
+You must create an application on [developer.tmb.cat](https://developer.tmb.cat/account/applications/public/new) to obtain the `app_id` and `app_key` values that you will need.
+
+Add the data to your `configuration.yaml` file as shown in the example:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+- platform: tmb
+  app_id: !secret tmb_app_id
+  app_key: !secret tmb_app_key
+  stops:
+    - line: V25
+      stop: 3258
+```
+
+{% configuration %}
+app_id:
+  description: Your TMB APP identifier.
+  required: true
+  type: string
+app_key:
+  description: Your TMB APP key.
+  required: true
+  type: string
+stops:
+  description: List of bus stops to track.
+  required: false
+  type: list
+  keys:
+    line:
+      description: Identifier of the line to track.
+      required: true
+      type: string
+    stop:
+      description: Stop identifier.
+      required: true
+      type: integer
+    name:
+      description: Name you want to use to identifier that stop.
+      required: false
+      type: string
+      default: "LINE - STOP"
+{% endconfiguration %}
+
+Data provided by [TMB](https://tmb.cat/).