text: Title: Request to add random walk index indicator
  Body: Can random walk index indicator be added to the panda-ta library ? thanks
  
  References:
  [Technical Indicators](https://www.technicalindicators.net/indicators-technical-analysis/168-rwi-random-walk-index)
  [trading sim](https://tradingsim.com/blog/random-walk-index/)
  [linnsoft](https://www.linnsoft.com/techind/random-walk-index)
  [fmlabs](https://www.fmlabs.com/reference/default.htm?url=rwi.htm)
  
  