text: Title: New indicator suggestion(Clenow momentum) 
  Body: **Is your feature request related to a problem? Please describe.**
  My request is a new indicator called Clenow momentum. 
  **Describe the solution you'd like**
  It measures momentum by getting the exponential regression  of log prices  and the Coefficient of Exponential Regression depending on the rolling days. It can detect trends in a stock as well as the direction of the stock.
  
  
  **Additional context**
  I've found several references on github referring to clenow momentum but none of them could calculate it in a pandas data frame. It would be awesome if it could be added to this library to set it apart from ta-lib. I also don't know how to codify it because I'm new to this programming. Here's further reference:
  
  https://chrischow.github.io/dataandstuff/2018-11-10-how-not-to-invest-clenow-momentum/
  it's also similar to this:
  https://www.tradingview.com/script/QWHjwm4B-Exponential-Regression-Slope-Annualized-with-R-squared-Histogram/
  I also found this reference but it's too abstract for me:
  https://teddykoker.com/2019/05/momentum-strategy-from-stocks-on-the-move-in-python/