Add: PS Script to generate .txt from .docx and .doc

[wlawt]

This PR focuses on creating a Powershell (PS) script (generate_txt.ps1) that will open up all the test_files files and save them as plain text .txt

At the moment, currently supports .doc .docx.

To run this script:

1. Run Set-ExecutionPolicy RemoteSigned OR Set-ExecutionPolicy -Scope Process -ExecutionPolicy Bypass in PS Admin 7.0
2. Close and rerun PS Admin 7.0
3. Have the PS script in the root of the repo
4. Run .\generate_txt.ps1 .\test_files\EXT_TYPE\FOLDER (ex. .\generate_txt.ps1 .\test_files\docx\apachepoi)

If you need to generate more plain text files:

1. Run the script
2. If the script requires a password you'll have to uncomment L27-29 and comment L26 and run the script
3. Finally, undo step 2

Results that you should be seeing:

• Word should be opening and closing (to grab and save the contents as .txt)
• There should be .txt files being generated in the same folder that you ran the script

Other edge cases to consider:

• The script will fail for documents that are broken (Word will prompt a notification to handle this)

[SheetJSDev]

Can you put the instructions for running the script somewhere in the repo (either as a section in the README.md or in a separate notes file)?

[garrettluu]

Looks mostly good to me!