Added a README and updated temperature conversion

Included a README file explaining how to use the application with images.

In addition, I converted the weather temperature output from Kelvin to Fahrenheit.

Author: mgndolan

tkinter_python_gui/README.md

@@ -0,0 +1,37 @@
+# Tkinter Python GUI Example - US City Weather Forecaster
+
+Tkinter is a Python module used to create cross-platform GUIs.  USWeatherForecast.py demonstrates an example of a Tkinter application.
+
+## How it works:
+1. Run the script `USWeatherForecast.py` by typing either:
+    ```bash
+    python3 USWeatherForecast.py
+    ```
+    or
+    ```bash
+    python USWeatherForecast.py
+    ```
+2. A window will pop up that looks like the following screen:
+
+![Windows 10 display of US Weather Forecaster application](./images/demo.png)
+
+From this screen, enter in a US city name and click the "Get Weather" button.
+
+3. The interface should update to display a table with the city's weather information.
+
+![Windows 10 display of US Weather Forecaster with city entries](./images/demoData.png)
+
+4. To add another city, enter a new city in the text box and click the "Add New City" button.
+
+
+## API Information
+The application displays the following information:
+
+- The US city name entered by the user
+- The current temperature in Fahrenheit
+- The minimum daily temperature (Fahrenheit)
+- The maximum daily temperature (Fahrenheit)
+- The current weather condition
+- A brief description of the type of weather condition (more detail)
+
+All of the above information is from the free, open-source [Open Weather Map RapidAPI](https://rapidapi.com/community/api/open-weather-map/)

tkinter_python_gui/USWeatherForecast.py

@@ -40,9 +40,9 @@ def createTable(data, city):
 # Populate table with weather information for each new US city
 def NewEntry(data, city):
     try:
-        temp = data['list'][1]['main']['temp']
-        temp_min = data['list'][1]['main']['temp_min']
-        temp_max = data['list'][1]['main']['temp_max']
+        temp = str(round((((int(data['list'][1]['main']['temp']) - 273.15) * 1.8) + 32), 2))
+        temp_min = str(round((((int(data['list'][1]['main']['temp_min']) - 273.15) * 1.8) + 32), 2))
+        temp_max = str(round((((int(data['list'][1]['main']['temp_max']) - 273.15) * 1.8) + 32), 2))
         weather = data['list'][2]['weather'][0]['main']
         weather_desc = data['list'][2]['weather'][0]['description']