Plugin: Add md_exporter tool for exporting Markdown to HTML, PDF, Docx, Xlsx, Pptx and .md files

[bowenliang123]

• Adding a tool plugin for exporting Mardown text to binary files in the following formats:
  • HTML file: Markdown -> HTML text -> HTML file
  • Docx file: Markdown -> Docx file
  • Xlsx file: Markdown -> HTML -> Pandas Dataframe -> Xlsx file
  • Pptx file: Markdown -> Pptx file ,
    • using md2pptx as local local library
    • For sytle and usage, refer to "Markdown To Powerpoint User Guide" at https://github.com/MartinPacker/md2pptx/blob/master/docs/user-guide.md
  • PDF file: Markdown -> HTML text -> PDF file
  • md file: A .md file with raw Markdown text
• Github repo: https://github.com/bowenliang123/md_exporter

pptx:

• Example markdown:

# This Is A Presentation Title Page

## This Is A Presentation Section Page

### This Is A Bulleted List Page

* One
    * One A
    * One B
* Two