examples: add web_crawler and get_weather (#10084)

examples/get_weather/README.md

@@ -0,0 +1,23 @@
+# get_weather
+get_weather is a very simple web crawler.
+Its goal is to get a weather forecast from caiyunapp.com.  
+
+# Compile and Run
+
+Use this to generate an executable and then launch the web crawler.
+```bash
+v get_weather.v
+./get_weather
+```
+
+As a convenience, you can also compile and launch the web crawler directly.
+```bash
+v run get_weather.v
+```
+
+In this project we use http.fetch() to get a http.Response, with a
+custom user-agent and then we use json.decode() to decode the json 
+response to struct.
+We also use a `[skip]` attribute to skip certain fields in the response,
+that we don't need and use a `[json: result]` attribute to specify that
+our struct field is named differently from the incoming json response.