forgejo/ISSUE_TEMPLATE: create Issue ticket template based on TRAC form

This is based on the previously used, simple TRAC form
with new description language.

We can iterate on it to improve as needed.

Signed-off-by: Yalda <marth64@proxyid.net>

.forgejo/ISSUE_TEMPLATE.md

@@ -0,0 +1,9 @@
+# Summary of the bug
+
+Briefly describe the issue you're experiencing. Include any error messages, unexpected behavior, or relevant observations.
+
+# Steps to reproduce
+
+List the steps required to trigger the bug.
+Include the exact CLI command used, if any.
+Provide sample input files, logs, or scripts if available.