Add contributions section

README.md

@@ -10,7 +10,11 @@
 
 > Ethereum HD Wallet derivations from [mnemonic] seed in Go (golang). Implements the [go-ethereum](https://github.com/ethereum/go-ethereum) [`accounts.Wallet`](https://github.com/ethereum/go-ethereum/blob/master/accounts/accounts.go) interface.
 
-[![License](http://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/miguelmota/go-ethereum-hdwallet/master/LICENSE) [![Build Status](https://travis-ci.org/miguelmota/go-ethereum-hdwallet.svg?branch=master)](https://travis-ci.org/miguelmota/go-ethereum-hdwallet) [![Go Report Card](https://goreportcard.com/badge/github.com/miguelmota/go-ethereum-hdwallet?)](https://goreportcard.com/report/github.com/miguelmota/go-ethereum-hdwallet) [![GoDoc](https://godoc.org/github.com/miguelmota/go-ethereum-hdwallet?status.svg)](https://godoc.org/github.com/miguelmota/go-ethereum-hdwallet)
+[![License](http://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/miguelmota/go-ethereum-hdwallet/master/LICENSE)
+[![Build Status](https://travis-ci.org/miguelmota/go-ethereum-hdwallet.svg?branch=master)](https://travis-ci.org/miguelmota/go-ethereum-hdwallet)
+[![Go Report Card](https://goreportcard.com/badge/github.com/miguelmota/go-ethereum-hdwallet?)](https://goreportcard.com/report/github.com/miguelmota/go-ethereum-hdwallet)
+[![GoDoc](https://godoc.org/github.com/miguelmota/go-ethereum-hdwallet?status.svg)](https://godoc.org/github.com/miguelmota/go-ethereum-hdwallet)
+[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](#contributing)
 
 ## Install
 
@@ -110,6 +114,12 @@ func main() {
 make test
 ```
 
+## Contributing
+
+Pull requests are welcome!
+
+For contributions please create a new branch and submit a pull request for review.
+
 ## License
 
 [MIT](LICENSE)