Update README.md

README.md

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 The datasets listed below are used in [Hann](https://github.com/habedi/hann) library.
 
-| Dataset                                                          | Dimensions | Train Size  | Test Size | Neighbors | Distance  | Original Source                                                                    |
-|------------------------------------------------------------------|-----------:|------------:|----------:|----------:|-----------|-----------------------------------------------------------------------------|
-| [DEEP1B](http://sites.skoltech.ru/compvision/noimi/)             |         96 |  9,990,000  |    10,000 |       100 | Cosine   | [HDF5](http://ann-benchmarks.com/deep-image-96-angular.hdf5) (3.6GB)        |
-| [GIST](http://corpus-texmex.irisa.fr/)                           |        960 |  1,000,000  |     1,000 |       100 | Euclidean | [HDF5](http://ann-benchmarks.com/gist-960-euclidean.hdf5) (3.6GB)           |
+| Index | Dataset                                              | Dimensions | Train Size | Test Size | Neighbors | Distance  | Original Source                                                      |
+|-------|------------------------------------------------------|-----------:|-----------:|----------:|----------:|-----------|----------------------------------------------------------------------|
+| 1     | [DEEP1B](http://sites.skoltech.ru/compvision/noimi/) |         96 |  9,990,000 |    10,000 |       100 | Cosine    | [HDF5](http://ann-benchmarks.com/deep-image-96-angular.hdf5) (3.6GB) |
+| 2     | [GIST](http://corpus-texmex.irisa.fr/)               |        960 |  1,000,000 |     1,000 |       100 | Euclidean | [HDF5](http://ann-benchmarks.com/gist-960-euclidean.hdf5) (3.6GB)    |
 
 ## Acknowledgement