leetcode algorithem collections for OSIM

• For each folder in collections represent a question on leetcode
  • Folder naming convention : ${\color{red}Full Question Name}$
    • e.g. /2. Add Two Numbers
• For each file in the folder represent a possible solution
  • Solution file naming conventions : ${\color{red}language-author.ext}$
    • e.g. /2. Add Two Numbers/python-suxuekun.py
  • you can write your idea in a md file
    • e.g. /2. Add Two Numbers/python-suxuekun.md
• create your own branch commit your solution and submit your PR to the main branch