added the doc 'development-workflow.md'

CONTRIBUTING.md

@@ -21,6 +21,8 @@ This is a rough outline of what a contributor's workflow looks like:
 - Submit a pull request.
 - Your PR must receive LGTMs from two maintainers.
 
+More specifics on the development workflow are in [development workflow](./docs/development-workflow.md).
+
 More specifics on the coding flow are in [development](./docs/development.md).
 
 Thanks for your contributions!

docs/development-workflow.md

@@ -0,0 +1,66 @@
+# Development Workflow
+
+
+Start by forking the `pd` GitHub repository, make changes in a branch and then send a pull request. 
+
+## Set up your pd GitHub Repository
+
+
+After forking the [PD upstream](https://github.com/pingcap/pd/fork) source repository to your personal repository. You can set up your personal development environment for PD project.
+
+```sh
+$ cd $GOPATH/src/github.com/pingcap
+$ git clone < your personal forked pd repo>
+$ cd pd
+```
+
+## Set git remote as ``upstream``
+
+
+```sh
+$ git remote add upstream https://github.com/pingcap/pd
+$ git fetch upstream
+$ git merge upstream/master
+...
+```
+
+## Create your feature branch
+
+
+Before making code changes, make sure you create a separate branch for them.
+
+```
+$ git checkout -b my-feature
+```
+
+## Test your changes
+
+
+After your code changes, make sure that you have:
+
+- Added test cases for the new code.
+- Run `make test`.
+
+
+## Commit changes
+
+
+After verification, commit your changes. 
+
+```
+$ git commit -am 'information about your feature'
+```
+
+## Push to the branch
+
+
+Push your locally committed changes to the remote origin (your fork).
+
+```
+$ git push origin my-feature
+```
+
+## Create a Pull Request
+
+
+Pull requests can be created via GitHub. Refer to [this document](https://help.github.com/articles/creating-a-pull-request/) for more details on how to create a pull request.