add bug_report template

src/Umbraco.Web.UI.Client/.github/ISSUE_TEMPLATE/01_bug_report.md

@@ -0,0 +1,51 @@
+---
+
+name: 🐛 Bug Report
+description: "File a bug report, if you've discovered a problem in the Backoffice."
+labels: "type/bug"
+body:
+
+- type: textarea
+  id: "summary"
+  attributes:
+  label: "Bug summary"
+  description: "Write a short summary of the bug."
+  placeholder: >
+  Try to pinpoint it as much as possible.
+
+      Try to state the actual problem, and not just what you think the solution might be.
+
+  validations:
+  required: true
+
+- type: textarea
+  attributes:
+  label: "Specifics"
+  id: "specifics"
+  description: "Remember that you can format code and logs nicely with the `<>` button"
+  placeholder: >
+  Mention the URL where this bug occurs, if applicable
+
+      Please mention if you've checked it in other browsers as well
+
+      Please include full error messages and screenshots, gifs or mp4 videos if applicable
+
+- type: textarea
+  attributes:
+  label: "Steps to reproduce"
+  id: "reproduction"
+  description: "How can we reproduce the problem on a clean Umbraco install?"
+  placeholder: >
+  Please include screenshots, gifs or mp4 videos if applicable
+  validations:
+  required: true
+
+- type: textarea
+  attributes:
+  label: "Expected result / actual result"
+  id: "result"
+  description: "What did you expect that would happen on your Umbraco site and what is the actual result of the above steps?"
+  placeholder: >
+  Describe the intended/desired outcome after you did the steps mentioned.
+
+      Describe the behaviour of the bug