[ADD] documentation for using the script

Author: MaheshBharadwaj

Scripts/Miscellaneous/Football-Standings/README.md

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+# Football Standings CLI
+
+Fetches the latest standings of major football leagues and displays the standings right in your terminal!
+
+### Prerequisites
+
+This script requires a  **free** API Key from [football-data.org](https://www.football-data.org/) for fetching the up-to-date standings of leagues.
+
+Save the Key obtained in **.env**  file as follows:
+
+**Before:**
+```bash
+API_KEY=YOUR_KEY_HERE
+```
+
+**After:**
+```bash
+API_KEY=xxxxxxxxxxxxxxxxxx
+```
+> NOTE: No spaces around `=` as this is a shell file 
+
+**Python prerequisites:**
+
+Run this command to install all required packages.
+
+```bash
+$pip install -r requirements.txt
+```
+
+### How to run the script
+
+```bash
+$python3 main.py --help | -h        # For displaying league codes of supported leagues
+$python3 main.py [league_code]      # For displaying realtime standings of the league
+```
+### Screenshot/GIF showing the sample use of the script
+
+![Screenshot of output](./output.png)
+
+
+## Author:
+
+[Mahesh Bharadwaj K](https://github.com/MaheshBharadwaj)

Scripts/Miscellaneous/Football-Standings/output.png

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+requests==2.20.0
+python-dotenv==0.14.0