added github issue and pull request templates (sulu#120)

.github/ISSUE_TEMPLATE.md

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+Create issues here only when you are 100% sure its not a sulu/sulu issue
+else create the issue in https://github.com/sulu/sulu/issues/new
+
+| Q | A
+| --- | ---
+| Bug? | no
+| New Feature? | no
+| Sulu Version | Specific version or SHA of a commit
+| Browser Version | Browser name and version
+
+#### Actual Behavior
+
+How does Sulu behave at the moment? 
+
+#### Expected Behavior
+
+What is the behavior you expect?
+
+#### Steps to Reproduce
+
+What are the steps to reproduce this bug? Please add code examples,
+screenshots or links to GitHub repositories that reproduce the problem.
+
+#### Possible Solutions
+
+If you have already ideas how to solve the issue, add them here.
+(remove this section if not needed)

.github/PULL_REQUEST_TEMPLATE.md

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+| Q | A
+| --- | ---
+| Bug fix? | no
+| New feature? | no
+| BC breaks? | no
+| Deprecations? | no
+| Fixed tickets | fixes #issuenum
+| Related issues/PRs | #issuenum
+| License | MIT
+| Documentation PR | sulu/sulu-docs#prnum
+
+#### What's in this PR?
+
+Explain the contents of the PR.
+
+#### Why?
+
+Which problem does the PR fix? (remove this section if you linked an issue above)
+
+#### Example Usage
+
+```php
+// If you added new features, show examples of how to use them here
+// (remove this section if not a new feature)
+
+$foo = new Foo();
+
+// Now we can do
+$foo->doSomething();
+```
+
+#### BC Breaks/Deprecations
+
+Describe BC breaks/deprecations here. (remove this section if not needed)
+
+#### To Do
+
+- [ ] Create a documentation PR
+- [ ] Add breaking changes to UPGRADE.md