addition of issues & PR templates

.github/ISSUE_TEMPLATE.md

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+### Before submitting an issue to Gitbucket I have first:
+
+- [] read the [contribution guidelines](https://github.com/gitbucket/gitbucket/blob/master/CONTRIBUTING.md)
+- [] searched for similar already existing issue
+- [] read the documentation and [wiki](https://github.com/gitbucket/gitbucket/wiki) 
+
+*(if you have performed all the above, remove the paragraph and continue describing the issue with template below)*
+
+## Issue
+**Impacted version**: xxxx
+
+**Deployment mode**: *explain here how you use gitbucket : standalone app, under webcontainer (which one), with an http frontend (nginx, httpd, ...)*
+
+**Problem description**:
+- *be as explicit has you can*
+- *describe the problem and its symptoms*
+- *explain how to reproduce*
+- *attach whatever information that can help understanding the context (screen capture, log files)*
+- *do your best to use a correct english (re-read yourself)*

.github/PULL_REQUEST_TEMPLATE.md

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+### Before submitting a pull-request to Gitbucket I have first:
+
+- [] read the [contribution guidelines](https://github.com/gitbucket/gitbucket/blob/master/CONTRIBUTING.md)
+- [] rebased my branch over master
+- [] verified that project is compiling
+- [] verified that tests are passing
+- [] squashed my commits as appropriate *(keep several commits if it is relevant to understand the PR)*
+- [] [marked as closed](https://help.github.com/articles/closing-issues-via-commit-messages/) all issue ID that this PR should correct