Add weather variable for chatbot (#13)

Author: styler

docs/chatbot/variables/weather.md

@@ -0,0 +1,24 @@
+---
+id: weather
+tags:
+  - chatbot
+  - variable
+---
+
+# $(weather)
+
+Displays the current weather conditions for a given location.
+
+#### Parameters
+
+- `location`: The location to get the weather for. (i.e. New York, NY)
+
+#### Example Input
+
+`$(weather "New York, NY")`
+
+#### Example Output
+
+```
+New York, United States of America: 🌜 13.9 °C (57.0 °F). Feels like 12.6 °C (54.8 °F). Overcast. Wind is blowing from the Northeast at 3.6 km/h (2.2 mp/h). 81% humidity. Visibility: 16 km (9 miles). Air pressure: 1026 hPa. 
+```