Refactor CONTRIBUTING.md to make it more reader friendly (#4918)

CONTRIBUTING.md

@@ -1,9 +1,14 @@
-### Install Golang
+# Minio Contribution Guide [![Slack](https://slack.minio.io/slack?type=svg)](https://slack.minio.io) [![Go Report Card](https://goreportcard.com/badge/minio/minio)](https://goreportcard.com/report/minio/minio) [![Docker Pulls](https://img.shields.io/docker/pulls/minio/minio.svg?maxAge=604800)](https://hub.docker.com/r/minio/minio/) [![codecov](https://codecov.io/gh/minio/minio/branch/master/graph/badge.svg)](https://codecov.io/gh/minio/minio)
 
-If you do not have a working Golang environment setup please follow [Golang Installation Guide](https://docs.minio.io/docs/how-to-install-golang).
+``Minio`` community welcomes your contribution. To make the process as seamless as possible, we recommend you read this contribution guide.
+
+## Development Workflow
+
+Start by forking the Minio GitHub repository, make changes in a branch and then send a pull request. We encourage pull requests to discuss code changes. Here are the steps in details:
 
 ### Setup your Minio Github Repository
-Fork [Minio upstream](https://github.com/minio/minio/fork) source repository to your own personal repository. Copy the URL for minio from your personal github repo (you will need it for the `git clone` command below).
+Fork [Minio upstream](https://github.com/minio/minio/fork) source repository to your own personal repository. Copy the URL of your Minio fork (you will need it for the `git clone` command below).
+
 ```sh
 $ mkdir -p $GOPATH/src/github.com/minio
 $ cd $GOPATH/src/github.com/minio
@@ -11,61 +16,56 @@ $ git clone <paste saved URL for personal forked minio repo>
 $ cd minio
 ```
 
-### Compiling Minio from source
+### Set up git remote as ``upstream``
-Minio uses ``Makefile`` to wrap around some of redundant checks done through command line.
-
-```sh
-$ make
-Checking if proper environment variables are set.. Done
-...
-Checking dependencies for Minio.. Done
-Installed govet
-Building Libraries
-...
-...
-```
-
-### Setting up git remote as ``upstream``
 ```sh
 $ cd $GOPATH/src/github.com/minio/minio
 $ git remote add upstream https://github.com/minio/minio
 $ git fetch upstream
 $ git merge upstream/master
 ...
-...
-$ make
-Checking if proper environment variables are set.. Done
-...
-Checking dependencies for Minio.. Done
-Installed govet
-Building Libraries
-...
 ```
 
-###  Developer Guidelines
+### Create your feature branch
-``Minio`` community welcomes your contribution. To make the process as seamless as possible, we ask for the following:
+Before making code changes, make sure you create a separate branch for these changes
-* Go ahead and fork the project and make your changes. We encourage pull requests to discuss code changes.
-    - Fork it
-    - Create your feature branch (git checkout -b my-new-feature)
-    - Commit your changes (git commit -am 'Add some feature')
-    - Push to the branch (git push origin my-new-feature)
-    - Create new Pull Request
 
-* If you have additional dependencies for ``Minio``, ``Minio`` manages its dependencies using [govendor](https://github.com/kardianos/govendor)
+```
+$ git checkout -b my-new-feature
+```
+
+### Test Minio server changes
+After your code changes, make sure
+
+- To add test cases for the new code. If you have questions about how to do it, please ask on our [Slack](slack.minio.io) channel.
+- To run `make verifiers`
+- To squash your commits into a single commit. `git rebase -i`. It's okay to force update your pull request.
+- To run `go test -race ./...` and `go build` completes.
+
+### Commit changes
+After verification, commit your changes. This is a [great post](https://chris.beams.io/posts/git-commit/) on how to write useful commit messages
+
+```
+$ git commit -am 'Add some feature'
+```
+
+### Push to the branch
+Push your locally committed changes to the remote origin (your fork)
+```
+$ git push origin my-new-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 detailed steps on how to create a pull request. After a Pull Request gets peer reviewed and approved, it will be merged.
+
+## FAQs
+### How does ``Minio`` manages dependencies? 
+``Minio`` manages its dependencies using [govendor](https://github.com/kardianos/govendor). To add a dependency
 - Run `go get foo/bar`
 - Edit your code to import foo/bar
 - Run `make pkg-add PKG=foo/bar` from top-level directory
 
-* If you have dependencies for ``Minio`` which needs to be removed
+To remove a dependency
 - Edit your code to not import foo/bar
 - Run `make pkg-remove PKG=foo/bar` from top-level directory
 
-* When you're ready to create a pull request, be sure to:
+### What are the coding guidelines for Minio?
-    - Have test cases for the new code. If you have questions about how to do it, please ask in your pull request.
+``Minio`` is fully conformant with Golang style. Refer: [Effective Go](https://github.com/golang/go/wiki/CodeReviewComments) article from Golang project. If you observe offending code, please feel free to send a pull request or ping us on [Slack](slack.minio.io).
-    - Run `make verifiers`
-    - Squash your commits into a single commit. `git rebase -i`. It's okay to force update your pull request.
-    - Make sure `go test -race ./...` and `go build` completes.
-
-* Read [Effective Go](https://github.com/golang/go/wiki/CodeReviewComments) article from Golang project
-    - `Minio` project is fully conformant with Golang style
-    - if you happen to observe offending code, please feel free to send a pull request