text: Title: chandelier_exit
  Body: Here is a code that i have written for chandelier_exit, if possible add to repo
  
  ```python
   def chandelier_exit(df1, atr_length=14, roll_length=22, mult=2, use_close=False):
          df = df1.copy()
          df.columns = df.columns.str.lower()
          my_atr = ta.Strategy(
              name="atr",
              ta=[{"kind": "atr", "length": atr_length, "col_names": ("ATR",)}]
          )
          # Run it
          df.ta.strategy(my_atr, append=True)
  
          if use_close:
              df['chandelier_long'] = df.rolling(roll_length)["close"].max() + df.iloc[-1]["ATR"] * mult
              df['chandelier_short'] = df.rolling(roll_length)["close"].min() - df.iloc[-1]["ATR"] * mult
          else:
              df['chandelier_long'] = df.rolling(roll_length)["high"].max() - df.iloc[-1]["ATR"] * mult
              df['chandelier_short'] = df.rolling(roll_length)["low"].min() + df.iloc[-1]["ATR"] * mult
          df.loc[df['close'] > df['chandelier_long'].shift(1), 'chd_dir'] = 1
          df.loc[df['close'] < df['chandelier_short'].shift(1), 'chd_dir'] = -1
          # chd = df[['chandelier_long', 'chandelier_short', 'chd_dir']]
          return df
  ```