Add templates for issues and pull requests

Author: fmbenhassine

.github/ISSUE_TEMPLATE.md

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+Thank you for taking time to open this issue!
+You might have already read the [README file][1] and the [Contributor Guide][2], but as a reminder, please check the following:
+
+### Asking questions
+
+If you have a question, please use [StackOverflow](https://stackoverflow.com/questions/tagged/spring-batch) and tag your question
+with `spring-batch`. We would like to keep the issue tracker exclusively for bug reports and feature requests.
+
+### Reporting bugs
+
+* Search Github issues first, and create an issue only if necessary (there might be already a duplicate issue)
+* Provide as much details as possible: Spring Batch version, Java version, which database you use if any, etc
+* If the bug is trivial, just go ahead and create the issue. Otherwise, please provide a failing unit test or a [minimal complete example][3] that reproduces the issue.
+
+### Requesting features
+
+* Search Github issues first, and create an issue only if necessary (the feature might have already been requested, but rejected)
+* Explain the reason why you need this feature (aka why it is not possible to implement the desired functionality with the current version)
+* Add a code example to explain what you think the feature should look like. This is optional, but it would help up understand your expectations.
+
+Thank you upfront!
+
+[1]: https://github.com/spring-projects/spring-batch/blob/master/README.md
+[2]: https://github.com/spring-projects/spring-batch/blob/master/CONTRIBUTING.md
+[3]: https://stackoverflow.com/help/minimal-reproducible-example

.github/PULL_REQUEST_TEMPLATE.md

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+Thank you for taking time to contribute this pull request!
+You might have already read the [contributor guide][1], but as a reminder, please make sure to:
+
+* Sign the [contributor license agreement](https://cla.pivotal.io/sign/spring)
+* Rebase your changes on the latest `master` branch and squash your commits
+* Add/Update unit tests as needed
+* Run a build and make sure all tests pass prior to submission
+
+For more details, please check the [contributor guide][1].
+Thank you upfront!
+
+[1]: https://github.com/spring-projects/spring-batch/blob/master/CONTRIBUTING.md