Add Crypto dataset from coingecko (#733)

* add crypto symbols collectors

* add crypto data collector

* add crypto symbols collectors

* add crypto data collector

* solver region and source problem

* fix merge

* fix merge

* clean all cn information

Co-authored-by: DefangCui <170007807@pku.edu.cn>

scripts/data_collector/crypto/README.md

@@ -0,0 +1,54 @@
+# Collect Crypto Data
+
+> *Please pay **ATTENTION** that the data is collected from [Coingecko](https://www.coingecko.com/en/api) and the data might not be perfect. We recommend users to prepare their own data if they have high-quality dataset. For more information, users can refer to the [related document](https://qlib.readthedocs.io/en/latest/component/data.html#converting-csv-format-into-qlib-format)*
+
+## Requirements
+
+```bash
+pip install -r requirements.txt
+```
+
+## Usage of the dataset
+> *Crypto dateset only support Data retrieval function but not support backtest function due to the lack of OHLC data.*
+
+## Collector Data
+
+
+### Crypto Data
+
+#### 1d from Coingecko
+
+```bash
+
+# download from https://api.coingecko.com/api/v3/
+python collector.py download_data --source_dir ~/.qlib/crypto_data/source/1d --start 2015-01-01 --end 2021-11-30 --delay 1 --interval 1d
+
+# normalize
+python collector.py normalize_data --source_dir ~/.qlib/crypto_data/source/1d --normalize_dir ~/.qlib/crypto_data/source/1d_nor --interval 1d --date_field_name date
+
+# dump data
+cd qlib/scripts
+python dump_bin.py dump_all --csv_path ~/.qlib/crypto_data/source/1d_nor --qlib_dir ~/.qlib/qlib_data/crypto_data --freq day --date_field_name date --include_fields prices,total_volumes,market_caps
+
+```
+
+### using data
+
+```python
+import qlib
+from qlib.data import D
+
+qlib.init(provider_uri="~/.qlib/qlib_data/crypto_data")
+df = D.features(D.instruments(market="all"), ["$prices", "$total_volumes","$market_caps"], freq="day")
+```
+
+
+### Help
+```bash
+python collector.py collector_data --help
+```
+
+## Parameters
+
+- interval: 1d
+- delay: 1