Add future trading date collector

scripts/data_collector/contrib/README.md

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+# Get future trading days
+
+> `D.calendar(future=True)` will be used
+
+## Requirements
+
+```bash
+pip install -r requirements.txt
+```
+
+## Collector Data
+
+```bash
+# parse instruments, using in qlib/instruments.
+python future_trading_date_collector.py --qlib_dir ~/.qlib/qlib_data/cn_data --freq day
+```
+
+## Parameters
+
+- qlib_dir: qlib data directory
+- freq: value from [`day`, `1min`], default `day`
+
+
+