Merge branch 'mysql-0.3.0' into 'branch-0.3.0'

MS-105 - Add MySQL

See merge request megasearch/vecwise_engine!137

Former-commit-id: 7dfd48be7f8832cfe72065cfd0a74a27b10f634a

cpp/README.md

@@ -53,6 +53,12 @@ If you encounter the following error when building:
 ### Launch server
 Set config in cpp/conf/server_config.yaml
 
+Add milvus/bin/lib to LD_LIBRARY_PATH
+
+```
+export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/path/to/milvus/bin/lib
+```
+
 Then launch server with config:
     cd [build output path]
     start_server.sh