Gitlab: Add issue template for Websites

Template to report Websites related issues similar to product "Web sites"
on bugs.wireshark.org.

.gitlab/issue_templates/Websites.md

@@ -0,0 +1,26 @@
+## Summary
+
+(Summarize the issue concisely)
+
+
+## Affected website
+
+(URL or name of the Wireshark website, including www.wireshark.org, ask.wireshark.org, and gitlab.com/wireshark etc.)
+
+
+## What is the exact issue
+
+(What actually is missing, wrong, not working as expected etc)
+
+
+## Relevant logs and/or screenshots
+```
+(Paste any relevant logs or screenshots)
+```
+
+## Additional information
+
+(Further information which may help to solve this issue)
+
+
+~"web sites"