correct installation instructions

Add missing nltk import and install pytorch first, before whisperspeech.  Verified that speechbrain's installation of pytorch does not override the cuda-version installed prior to it like I thought it might.  Therefore, no need to install whisperspeech first (which installs speechbrain), uninstall pytorch, and then reinstall a cuda (or other) version of pytorch.

Also, added specific version of libraries to install in case there are breaking changes in any future releases.  Can be changed to newer version if need be in the future of course.

examples/gui_file_to_text_to_audio_playback.py

@@ -4,18 +4,18 @@
 Type text or load a file to be converted TTS, sentence by sentence, to quickstart playback.
 
 INSTALLATION INSTRUCTIONS~
+**Tested on Windows
+
+(1)  create a virtual environment and activate it
+(2)  install pytorch by going to the following website and running the appropriate command for your platform and setup:
 
-(1)  remember to create a virtual environment and activate it
-(2)  pip3 install WhisperSpeech
-WhisperSpeech relies on SpeechBrain, which automatically installs pytorch.  However, it reportedly installs a cpu-only version.  Thus, to use CUDA (which this script needs) you must run the following command after installing WhisperSpeech:
-(3)  pip3 uninstall torch torchvision torchaudio
-(4)  Then reinstall pytorch by going here to get the appropriate command:
 https://pytorch.org/get-started/locally/
-(5)  pip3 install soundfile
-(6)  pip3 install sounddevice
-(7)  pip3 install pypdf
-(8)  pip3 install python-docx
-(9)  python gui_text_to_audio_playback.py
+
+(3)  run pip3 install WhisperSpeech
+
+(4)  pip3 install soundfile==0.12.1 sounddevice==0.4.6 pypdf==4.0.2 python-docx==1.1.0 nltk==3.8.1
+
+(9)  python gui_file_to_text_to_audio_playback.py
 '''
 
 from tkinter import *
@@ -29,12 +29,9 @@
 from pypdf import PdfReader
 from docx import Document
 import nltk
-
-# Ensure NLTK punkt tokenizer is available
 nltk.download('punkt')
 from nltk.tokenize import sent_tokenize
 
-# color scheme
 main_bg = "#1B2A2F"
 widget_bg = "#303F46"
 button_bg = "#263238"