text: Title:  Half trend  ( by everget ) indicator  a custom indicator in trading view . can it be added ??
  Body: **Which version are you running? The lastest version is on Github. Pip is for major releases.**
  ```python
  import pandas_ta as ta
  print(ta.version)
  ```
  
  **Upgrade.**
  ```sh
  $ pip install -U git+https://github.com/twopirllc/pandas-ta
  ```
  
  **Is your feature request related to a problem? Please describe.**
  A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
  
  **Describe the solution you'd like**
  A clear and concise description of what you want to happen.
  
  **Describe alternatives you've considered**
  A clear and concise description of any alternative solutions or features you've considered.
  
  **Additional context**
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  Thanks for using Pandas TA!
  