BOM weather current documentation (#932)

* add bom_weather_current documentation

* wrong fork

* wrong fork

* update ha_release in documentation

source/_components/sensor.bom_weather_current.markdown

@@ -0,0 +1,78 @@
+---
+layout: page
+title: "Bureau of Meteorology Australia current weather"
+description: "Instructions on how to integrate Bureau of Meteorology Australia current weather conditions into Home Assistant."
+date: 2016-09-13 18:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: bom.png
+ha_category: Weather
+featured: false
+ha_release: 0.29
+---
+
+The `bom_weather_current` platform allows you to get the current weather conditions from the Bureau of Meteorology (BOM) Australia.
+- Each sensor will be given the device_id of "bom [optionalname] friendlyname units"
+- Get the station id for your local BOM station from BOM > State > Observations > Latest Observations > Choose the station > read the url
+- The url will look like "http://www.bom.gov.au/products/IDS60801/IDS60801.94675.shtml". This is for Adelaide.
+- The url is read as: "http://www.bom.gov.au/products/[zone_id]/[zone_id].[wmo_id].shtml"
+- A name is optional but if multiple bom weather stations are used a name will be required.
+- The sensor will update every minute 35 minutes after last data timestamp. This allows for the 30 minute observation cycle and the approximate 5 minute update delay in publishing the data.
+
+
+
+To add the BOM weather observation to your installation, add the following to
+your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  platform: bom_weather_current
+  name: "optional name"
+  zone_id: IDS60801
+  wmo_id: 94675
+  monitored_conditions:
+    - wmo
+    - name
+    - history_product
+    - local_date_time
+    - local_date_time_full
+    - aifstime_utc
+    - lat
+    - lon
+    - apparent_t
+    - cloud
+    - cloud_base_m
+    - cloud_oktas
+    - cloud_type_id
+    - cloud_type
+    - delta_t
+    - gust_kmh
+    - gust_kt
+    - air_temp
+    - dewpt
+    - press
+    - press_qnh
+    - press_msl
+    - press_tend
+    - rain_trace
+    - rel_hum
+    - sea_state
+    - swell_dir_worded
+    - swell_height
+    - swell_period
+    - vis_km
+    - weather
+    - wind_dir
+    - wind_spd_kmh
+    - wind_spd_kt
+```
+
+Configuration variables:
+
+- **zone_id** (*Required*): The zone_id as identified from the BOM website.
+- **wmo_id** (*Required*): The wmo as identified from the BOM website.
+- **name** (*Optional*): The name you would like to give to the weather station.
+- **monitored_conditions** (*Required*): A List of the conditions to monitor