Added some sensors and example of other sensors

sensors.yaml

@@ -12,3 +12,20 @@
           off
         {% endif %}
       icon_template: mdi:motion-sensor
+
+    entities_count:
+      friendly_name: "Number of Entities"
+      value_template: >-
+        {{ states | rejectattr('state', 'eq', 'unavailable') | list | count}}
+    na_entities_count:
+      friendly_name: "Number of NA Entities"
+      value_template: >-
+        {{ states | selectattr('state', 'eq', 'unavailable') | map(attribute='entity_id') | list | count }}
+    holiday:
+      friendly_name: "Holiday"
+      value_template: >-
+        {% if states.calendar.holidays_in_italy.state == 'on' %}
+          {{ states.calendar.holidays_in_italy.attributes.message }}
+        {% else %}
+          none
+        {% endif %}