Add erasure package in its full form v1.0

pkg/storage/erasure/CONTRIBUTING.md

@@ -0,0 +1,30 @@
+### Setup your Erasure Github Repository
+Fork [Erasure upstream](https://github.com/minio-io/erasure/fork) source repository to your own personal repository. Copy the URL and pass it to ``go get`` command. Go uses git to clone a copy into your project workspace folder.
+```sh
+$ git clone https://github.com/$USER_ID/erasure
+$ cd erasure
+$ mkdir -p ${GOPATH}/src/github.com/minio-io
+$ ln -s ${PWD} $GOPATH/src/github.com/minio-io/
+```
+
+### Compiling Erasure from source
+```sh
+$ go generate
+$ go build
+```
+###  Developer Guidelines
+To make the process as seamless as possible, we ask for the following:
+* 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
+* When you're ready to create a pull request, be sure to:
+  - Have test cases for the new code. If you have questions about how to do it, please ask in your pull request.
+  - Run `go fmt`
+  - 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
+  - `Erasure` project is strictly conformant with Golang style
+  - if you happen to observe offending code, please feel free to send a pull request