Add World Tides docs (#3228)

* Add World Tides docs

source/_components/sensor.worldtidesinfo.markdown

@@ -0,0 +1,32 @@
+---
+layout: page
+title: "World Tides"
+description: "Instructions how to add Tides information to Home Assistant."
+date: 2017-08-23 08:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: worldtidesinfo.png
+ha_category: Weather
+ha_release: 0.52
+---
+
+The `worldtidesinfo` sensor platform uses details from [World Tides](https://www.worldtides.info/) to provide information about the prediction for the tides for any location in the world. 
+
+To use this sensor, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: worldtidesinfo
+    api_key: YOUR_API_KEY
+```
+
+Configuration variables:
+
+- **api_key** (*Required*): Your API key for https://www.worldtides.info/.
+- **name** (*Optional*): Name to use in the frontend.
+- **latitude** (*Optional*): Latitude of the location to display the tides. Defaults to the latitude in your `configuration.yaml` file. 
+- **longitude** (*Optional*): Longitude of the location to display the tides. Defaults to the longitude in your `configuration.yaml` file.
+