Update README.md

README.md

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 # Countdown-Timer
-A Simple Countdown Timer made in python using tkinter and win10toast
+A Simple Countdown Timer made in `python` using `tkinter` and `win10toast`
+
+**NOTE THAT THIS APP IS ONLY FOR WINDOWS BECUZ WIN10TOAST IS WINDOWS 10 ONLY!**
+
+The code is small and simple
+
+## GUI
+![image](https://user-images.githubusercontent.com/98301106/162178005-79a4b7c6-c9ae-4d15-afb8-461b14282ec9.png)
+
+## Dependencies
+
+This app required [python](https://www.python.org/downloads) to be installed in your computer
+
+This app also requires some packages like `tkinter` and `win10toast`. They can be installed by entering the following commands in the command prompt/terminal:
+```sh
+pip install tk
+```
+and 
+```sh
+pip install win10toast
+```
+
+Alternatively, you can also install all of these packages by entering one command in the command prompt/terminal by navigating to the path where the repository is downloaded and entering the following command:
+```sh
+pip install -r dependencies.txt
+```
+
+## Instructions to run the app
+
+**STEP 1** - Make sure your `python` and `pip` is up to date
+
+**STEP 2** - Download the exe file provided in the latest release
+
+**STEP 3** - Run the exe file and you are good to go :)