[gimp] .gitlab: add "performance" issue template

[Ell <ell src gnome org>]

commit e3b6c8e87712874d157de09bb0d2a2e7e5668bec
Author: Ell <ell_se yahoo com>
Date:   Thu Nov 8 03:45:43 2018 -0500

    .gitlab: add "performance" issue template
    
    Add a "performance" issue template, which should be used to report
    performance-related issues.

 .gitlab/issue_templates/performance.md | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
---
diff --git a/.gitlab/issue_templates/performance.md b/.gitlab/issue_templates/performance.md
new file mode 100644
index 0000000000..2db81c2554
--- /dev/null
+++ b/.gitlab/issue_templates/performance.md
@@ -0,0 +1,30 @@
+GIMP Version:
+
+Operating System:
+
+Package: [flatpak? Installer from gimp.org? If another installer, tell us where from]
+
+# Issue Description
+
+Please provide a general description of the issue.
+
+# Performance Log
+
+Please record a performance log demonstrating the issue, and attach it to the report.
+See
+
+  https://gitlab.gnome.org/GNOME/gimp/blob/master/devel-docs/performance-logs/performance-logs.md
+
+for more information.
+
+# Performance Log Description
+
+Please describe in detail the actions performed in the performance log.
+If you added empty event markers to the log, please provide a description for them here.
+If you recorded a screencast while recording the log, please attach it here.
+
+# Additional Information
+
+If there is any additional information, please provide it here.
+
+/label ~"1. Performance"