feature: add more technical indicators

[narumiruna]

7 Technical Indicators to Build a Trading Toolkit TA-Lib Technical Analysis Library in Python

• [x] On-Balance Volume (OBV) #226
• [x] Accumulation/Distribution Indicator (A/D) #227
• [ ] Average Directional Index (ADX)
• [ ] Aroon Oscillator
• [x] Moving Average Convergence Divergence (MACD) #219
• [x] Relative Strength Index (RSI) #500
• [x] Stochastic Oscillator (KD) #250
• [x] Average True Range (ATR) #536