SMHI weather service (#6375)

* SMHI weather service

* Added logo

* Added component docs as well

* ✏️ Spelling & grammar

* Changed realease to 0.81 and removed redundant information

source/_components/smhi.markdown

@@ -0,0 +1,54 @@
+---
+layout: page
+title: "SMHI"
+description: "Instructions on how to integrate SMHI forecasts within Home Assistant."
+date: 2018-09-23 20:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+featured: true
+logo: smhi.png
+ha_category: Hub
+ha_release: 0.81
+ha_iot_class: "Cloud Polling"
+---
+
+The `smhi` component adds support for the [SMHI.se](https://www.smhi.se/) web service as a source for meteorological data for your location.
+
+## {% linkable_title Configuration %}
+
+The SMHI weather service is free under the Creative Commons Attribution 4.0, international license. Weather data will be pulled once every 30 minutes.
+
+To add SMHI weather forecast to your installation, go to the Integrations page inside the config panel and add a location by providing the longitude and latitude of your location.
+
+If the location is configured in Home Assistant, it will be selected as the default location. After that, you can add additional locations.
+
+<p class='note warning'>
+You can only add locations through the integrations page, not in configuration files.
+</p>
+
+<p class='note warning'>
+Only location close to Sweden can be added. See [SMHI.se area](http://opendata.smhi.se/apidocs/metfcst/geographic_area.html) for more details what locations are supported.
+</p>
+
+
+{% configuration %}
+latitude:
+  description: Manually specify latitude. 
+  required: false
+  type: number
+  default: Provided by Home Assistant configuration
+longitude:
+  description: Manually specify longitude. 
+  required: false
+  type: number
+  default: Provided by Home Assistant configuration
+name:
+  description: Name to use in the frontend.
+  required: false
+  type: string
+  default: Home
+{% endconfiguration %}
+
+Details about the API are available in the [SMHI API documentation](http://opendata.smhi.se/apidocs/metfcst/index.html).

source/_components/weather.smhi.markdown

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+---
+layout: page
+title: "SMHI Weather"
+description: "Instructions on how to integrate SMHI forecasts within Homeassistant."
+date: 2018-09-23 20:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+featured: true
+logo: smhi.png
+ha_category: Weather
+ha_release: 0.81
+ha_iot_class: "Cloud Polling"
+---
+
+The `smhi` platform uses the [SMHI.se](https://www.smhi.se/) web service as a source for meteorological data for your location.
+
+## {% linkable_title Configuration %}
+
+Please see the [component](/components/smhi/) documentation for details and configuration.