Updating README

README.md

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+#CLI Weather
+
+Get weather information from straight from the terminal. Simple script to interact with OpenWeatherMap's API
+
+### Usage
+```
+$ ./cli_weather.rb 11238
+Brooklyn Weather | Current Temp: 38.5 °F | clear sky
+```
+
+If no zip code is provided, the user will be promted to provide one:
+```
+$ ./cli_weather.rb
+Please enter the Zip code for the city you wish to get weather information
+08411
+Atlantic City Weather | Current Temp: 42.32 °F | clear sky
+```