First upload to github

README.md

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+# homeassistant-prometheus-query
+Inspired from homeassitant Command line Sensor this sensor take values from [Prometheus](https://prometheus.io/) metrics using [PromQL](https://prometheus.io/docs/prometheus/latest/querying/basics/) query .  It allow to specify one or more query.
+
+## Configuration
+
+To enable it, add the following lines to your `configuration.yaml`:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: prometheus-query
+    name: Temperature Pisa
+    prometheus_url: http://localhost:9090
+    prometheus_query: temperature{location="Pisa",province="PI",region="Tuscany"}
+    unit_of_measurement: "°C"
+```
+
+### Configuration Variables
+
+-  name
+
+  (string)(Required) Name of the sensor..
+
+-  prometheus_url
+
+  (string)(Required) the url of your Prometheus server
+
+-  prometheus_query
+
+  (string)(Required) the PromQL query to retrieva sensor 
+
+-  unit_of_measurement
+
+  (string)(Optional) Defines the unit of measurement of the sensor, if any.
+
+It's a custom component so it must be downloaded under /custom_components folder.