add Screenshot script (#164)

* Add text-to-sound script

* fix failed check is about blank

* add screenshot script

* fix failed issues from screenshot.py

* fix again sorry

screenshot/README.md

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+# Screenshot
+
+Screenshot is a Python script for taking a screenshot.
+
+## Library used
+- tkinter
+- PyAutoGUI
+
+## Setup
+
+Install the packages listed in `requirements.txt` using `pip`
+
+```bash
+pip install -r requirements.txt
+```
+
+## Usage
+
+```bash
+cd screenshot
+python screenshot.py
+```

screenshot/requirements.txt

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+PyAutoGUI==0.9.50
+tk==0.1.0

screenshot/screenshot.py

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+import tkinter as tk
+from tkinter import messagebox
+import pyautogui
+import os
+
+
+root = tk.Tk()
+time = tk.IntVar()
+time.set(3)
+
+
+def take_shot():
+    timeleft = time.get()
+    if timeleft > 0:
+        timeleft -= 1
+        time.set(timeleft)
+        root.after(1000, take_shot)
+    else :
+        s = pyautogui.screenshot()
+# Save a screenshot on current working directory
+        s.save(os.getcwd() + "shot.png")
+        messagebox.showinfo("Screenshot", "Screenshot saved!")
+        time.set(3)
+
+
+L = tk.Label(root, textvariable=time, fg="blue")
+L.pack()
+
+b = tk.Button(root, text="Take Screenshot 3 secs", command=take_shot)
+b.pack()
+
+root.mainloop()