Add development.md for contributor to setup environment(#195) (#196)

Signed-off-by: xiaofan-luan <xiaofan.luan@zilliz.com>

DEVELOPMENT.md

@@ -0,0 +1,32 @@
+# Development
+This document will help to setup your development environment and running tests for milvus java sdk. If you encounter a problem, please file an issue.
+
+## Getting started
+
+### Prerequisites
+    -   Java 8 or higher
+    -   Apache Maven
+
+## Building Milvus java SDK
+call the following command to generate protobuf related code
+```shell
+  mvn install
+```
+
+## Building Milvus
+see detailed information at:
+https://github.com/milvus-io/milvus/blob/master/DEVELOPMENT.md
+
+## Start a Milvus cluster
+You need to start a latest milvus cluster to test the java SDK, see instructions at:
+https://milvus.io/docs/v2.0.0/install_standalone-docker.md
+
+### Unit Tests
+All unit test is under director src/test, TBD
+
+## GitHub Flow
+Milvus SDK repo follows the same git work flow as milvus main repo, see
+https://milvus.io/community/contributing_to_milvus.md
+
+If you have any questions about how to fork, clone, create branch, commit, push, open a pull request,
+please see https://github.com/firstcontributions/first-contributions