Update README.md file

Author: PatelKeviin

System-Automation-Scripts/Email_Client/README.md

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 # Email Client using Python for automating email shooting process
-Python email client that can be used to automate email sending process.
+Python email client that can be used to automate email sending process.
+
+## Pre-requisites :rotating_light:
+[![GitHub top language](https://img.shields.io/github/languages/top/vinitshahdeo/PortScanner?logo=python&logoColor=white)](https://www.python.org/)
+- **Python** `>= v3.7.x`
+    - Install Python from [here](https://www.python.org/).
+- **Pip** `>= v20.0.x`
+    - Install pip from [here](https://pip.pypa.io/en/stable/installing/).
+
+## How to run? :rocket:
+### To run Email Client: (Via Terminal)
+- Update `email_client.py` file to enter Email credentials for the sender account as well as the recipient's address.
+- **Open terminal** and type **`python Email_CLient/email_client.py`**.