scripts for ctags and cscope

[samuelololol]

Add shell scripts for generating tags and cscope db

• [ ] ctags for python
• [ ] ctags for c/cpp
• [ ] cscope for c/cpp

Add vim function to invoke scripts above

• [ ] refactor: https://github.com/samuelololol/dotfiles/blob/master/.vim/samuelololol/plugin/mycsct.vim

[samuelololol]

Do generate tags and cscope db by Asyncrun plugin