Add issue templates and updated PR template

docs/ISSUE_TEMPLATE/1_Bug.md

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+---
+name: 🐛 Bug Report
+about: File a bug report, if you've discovered a problem in Umbraco.
+---
+
+A brief description of the issue goes here.
+
+<!--
+
+If you haven't yet done so, please read the "contributing guidelines"
+thoroughly. Then, proceed by filling out the rest of the details in the issue
+template below. The more details you can give us, the easier it will be for us
+to determine the cause of a problem.
+
+See: https://github.com/umbraco/Umbraco-CMS/blob/dev-v7/docs/CONTRIBUTING.md
+
+-->
+
+
+
+Reproduction
+------------
+
+If you're filing a bug, please describe how to reproduce it. Include as much
+relevant information as possible, such as:
+
+### Bug summary
+
+<!--
+    * Write a short summary of the bug
+    * Try to pinpoint it as much as possible
+    * Try to state the _actual problem_, and not just what you _think_ the
+      solution might be.
+-->
+
+### Specifics
+
+<!--
+    * Mention the URL where this bug occurs, if applicable
+    * What version of Umbraco are you using (down to the very last digit!)
+    * What browser and version you are using
+    * Please mention if you've checked it in other browsers as well
+    * Please include *full error messages* and *screenshots* if possible
+-->
+
+### Steps to reproduce
+
+<!--
+    * Clearly mention the steps to reproduce the bug
+-->
+
+### Expected result
+
+<!--
+    * What did you _expect_ that would happen on your Umbraco site?
+    * Describe the intended/desired outcome after you did the steps mentioned.
+-->
+
+### Actual result
+
+<!--
+    * What is the actual result of the above steps?
+    * Describe the behaviour of the bug
+    * Please, please include **error messages** and screenshots. They might mean
+      nothing to you, but they are _very_ helpful to us.
+-->

docs/ISSUE_TEMPLATE/2_Feature_request.md

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+---
+name:  📮 Feature Request
+about: Open a feature request, if you want to propose a new feature.
+---
+
+A brief description of your feature request goes here.
+
+
+<!--
+If you want to discuss the feature you're imagining, please make sure to keep
+those discussions on the forum at https://our.umbraco.com/ (choose the
+category "Contributing to Umbraco", Umbraco HQ follows all new topics there).
+
+Once you've come to a conclusion in the discussion, feel free to propose the
+new feature here. 
+-->
+
+How can you help?
+-------------------------------
+
+<!--
+The resources (read: available time and effort) of Umbraco's core team are
+limited.
+
+If we can not work on your suggestion, please don't take it personally. Most
+likely, it's either:
+
+ - We think your idea is valid, but we can't find the time to work on it.
+ - Your idea might be better suited as a package, if it's not suitable for
+   the majority of users.
+-->

docs/ISSUE_TEMPLATE/3_Support_question.md

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+---
+name: ⁉️ Support Question
+about: Having trouble with Umbraco? -> https://our.umbraco.com
+---
+
+This issue tracker is NOT meant for support questions. If you have a question,
+please join us on the forum at https://our.umbraco.com.
+
+Thanks!

docs/ISSUE_TEMPLATE/4_Documentation_issue.md

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+---
+name: 📖 Documentation Issue
+about: See https://github.com/umbraco/UmbracoDocs/issues for documentation issues
+---
+
+The Umbraco documentation has its own dedicated repository. Please open your
+documentation-related issue at https://github.com/umbraco/UmbracoDocs/issues
+
+Thanks!

docs/ISSUE_TEMPLATE/5_Security_issue.md

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+---
+name: 🔐 Security Issue
+about: Discovered a Security Issue in Umbraco?
+---
+
+⚠️ PLEASE DON'T DISCLOSE SECURITY-RELATED ISSUES PUBLICLY, SEE BELOW.
+
+If you have found a security issue in Umbraco, please send the details to
+security@umbraco.com and don't disclose it publicly until we can provide a fix for
+it. If you wish, we'll credit you for finding verified issues, when we release
+the patched version.
+
+❗ Please read more about how to report security issues on https://umbraco.com/security
+
+A note on "Self XSS"
+--------------------
+
+Umbraco is a CMS, that allows users to edit content on a website. As such,
+all _authenticated users_ can:
+
+ - Edit content, and (depending on the field types) insert HTML and CSS in that
+   content, with a variety of allowed attributes.
+ - Depending on the user level: Edit template files, and insert C#, HTML, CSS and
+   javascript in so on.
+ - Upload files to the site, which will become publicly available.
+
+We see these functionalities as _features_, and not as security issues. Please
+report the mentioned items only if they can be performed by non-authorized
+users, or other exploitable vulnerabilities.
+
+Thanks!

docs/PULL_REQUEST_TEMPLATE.md

@@ -1,11 +1,11 @@
 ### Prerequisites
 
-- [ ] I have written a descriptive pull-request title
-- [ ] I have linked this PR to an issue on the tracker at http://issues.umbraco.org
+- [ ] I have [created an issue](https://github.com/umbraco/Umbraco-CMS/issues) for the proposed changes in this PR, the link is:
+- [ ] I have added steps to test this contribution in the description below
 
 ### Description
 <!-- A description of the changes proposed in the pull-request -->
-
+<!-- Make sure to link to the related issue number so we can easily find it in the issue tracker -->
 
 
 <!-- Thanks for contributing to Umbraco CMS! -->