Merge pull request uken#618 from uken/add-contribution-guideline-document

Add contribution guideline document

Author: cosmo0920

CONTRIBUTING.md

@@ -0,0 +1,24 @@
+Contributing to fluent-plugin-elasticsearch
+===
+
+We'd love your contribution. Here are the guidelines!
+
+## Got a question or problem?
+
+RESOURCES of [Official site's documentation](https://docs.fluentd.org/output/elasticsearch) and [ES plugin documentation](https://github.com/uken/fluent-plugin-elasticsearch/blob/master/README.md) may help you.
+
+If you have further questions about ES plugin, feel free to [open an Issue](https://github.com/uken/fluent-plugin-elasticsearch/issues).
+
+## Found a bug?
+
+If you find a bug of ES plugin or a mistake in the documentation, you can help us by submitting an issue to ES plugin. Even better you can submit a pull request with a fix.
+
+Note: Please follow the issue template/pull request template when sending your issue. Otherwise, your issue _might going to be closed with no response_.
+
+## Patch Guidelines
+
+Here are some things that would increase a chance that your patch is accepted:
+
+* Write tests
+* Run tests before sending pull request with `bundle exec rake test`
+* Write [a good commit message](https://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html)

ISSUE_TEMPLATE.md

@@ -1,3 +1,6 @@
+(check apply)
+- [ ] read [the contribution guideline](CONTRIBUTING.md)
+
 #### Problem
 
 ...

README.md

@@ -1502,6 +1502,8 @@ There are usually a few feature requests, tagged [Easy](https://github.com/uken/
 
 Pull Requests are welcomed.
 
+Becore send a pull request or report an issue, please read [the contribution guideline](CONTRIBUTING.md).
+
 [![Pull Request Graph](https://graphs.waffle.io/uken/fluent-plugin-elasticsearch/throughput.svg)](https://waffle.io/uken/fluent-plugin-elasticsearch/metrics)
 
 ## Running tests