Merge branch 'pattern-issue-template' into 'master'

Add UX Pattern issue template

See merge request !11

.gitlab/issue_templates/UX Pattern.md

+### Problem
+
+(What’s the problem that this pattern solves? Why is it worth solving?)
+
+### Solution
+
+(What’s the solution? Why is it like that? What are the benefits?)
+
+### Example(s)
+
+(One or more images showing the UX pattern. They don’t have to be in GitLab.)
+
+### Usage
+
+(When do you use this pattern? And how?)
+
+#### Dos and dont's
+
+(Use this table to add images and text describing what’s ok and not ok.)
+
+| :white_check_mark:  Do | :stop_sign: Don’t |
+|------------------------|-------------------|
+|  |  |
+
+### Related patterns
+
+(List any related or similar solutions. If none, write: No related patterns)
+
+### Links / references
+
+### Pattern checklist
+
+Make sure these are completed before closing the issue,
+with a link to the relevant commit, if applicable.
+
+1. [ ] Add to the [UX Guide](https://docs.gitlab.com/ce/development/ux_guide/)
+1. [ ] Add to the Design Library
+1. [ ] Add an agenda item to the next UX weekly call to inform everyone
+
+/label ~"UX"
+/cc @cperessini @dimitrieh @hazelyang @pedroms @sarrahvesselov @sarahod @tauriedavis