#89 update README.md

Former-commit-id: 0b85b430c0d4a69e0470e916a76adda16f96c12b

core/src/index/unittest/faiss_benchmark/README.md

+### To run this FAISS benchmark, please follow these steps:
+ 
+#### Step 1:
+Download the HDF5 source from:
+  https://support.hdfgroup.org/ftp/HDF5/releases/
+and build/install to "/usr/local/hdf5".
+
+#### Step 2:
+Download HDF5 data files from:
+  https://github.com/erikbern/ann-benchmarks
+
+#### Step 3:
+Update 'milvus/core/src/index/unittest/CMakeLists.txt',
+uncomment "#add_subdirectory(faiss_benchmark)".
+
+#### Step 4:
+Build Milvus with unittest enabled: "./build.sh -t Release -u",
+binary 'test_faiss_benchmark' will be generated.
+
+#### Step 5:
+Put HDF5 data files into the same directory with binary 'test_faiss_benchmark'.
+
+#### Step 6:
+Run test binary 'test_faiss_benchmark'.
+

core/src/index/unittest/faiss_benchmark/README.txt

-To run this FAISS benchmark, please follow these steps:
- 
-1. Download the HDF5 from:
-     https://support.hdfgroup.org/ftp/HDF5/releases/
-   and install to /usr/local/hdf5
-
-2. Download HDF5 data files from:
-     https://github.com/erikbern/ann-benchmarks
-
-3. Put HDF5 data files into the same directory with test binary
-
-4. Run the test binary
-