Add qlib CSI300 test datasets

README.md

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+# How to read files.
+For example, if you want to read `filename.h5`
+```Python
+import pandas as pd
+df = pd.read_hdf("filename.h5", key="data")
+```
+NOTE: **key is always "data" for all hdf5 files **.
+
+# Here is a short description about the data
+
+| Filename       | Description                                                      |
+| -------------- | -----------------------------------------------------------------|
+| "daily_pv.h5"  | Adjusted daily price and volume data.                            |
+
+
+# For different data, We have some basic knowledge for them
+
+## Daily price and volume data
+$open: open price of the stock on that day.
+$close: close price of the stock on that day.
+$high: high price of the stock on that day.
+$low: low price of the stock on that day.
+$volume: volume of the stock on that day.
+$factor: factor value of the stock on that day.

quantaalpha_testdata.h5

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+version https://git-lfs.github.com/spec/v1
+oid sha256:a357dcc5f641161af9661d9b1605f2f66844de37f8e02b0bc881e87ed16f3e9b
+size 398130836

quantaalpha_testdata_debug.h5

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+version https://git-lfs.github.com/spec/v1
+oid sha256:03816baa04a9ccefeaca8ccd6968c30f6a9a879330ae496d6fa19d6cd3208ebc
+size 1407056