adding templates for issues

.gitlab/issue_templates/bug.md

+## Bug description and behavior
+
+
+## Steps to reproduce
+
+
+## Expected behavior?
+
+
+## Relevant logs and/or screenshots
+
+
+## Possible fixes
+
+(If you can, link to the line of code that might be responsible for the problem)
+
+
+
+
+/label ~bug
+
+(Please add other relevant labels if any)
\ No newline at end of file

.gitlab/issue_templates/metadata.md

+- [ ] Concerns the metadata schema
+
+- [ ] Existing metadata key
+
+- [ ] New metadata key required
+
+
+## Describe the problem or requirement
+
+
+## Do you have a propopsal already?
+
+
+## Linked issues
+
+(Please tag potentially related issues)
+
+/label ~metadata
+
+(Please add other relevant labels if any)
\ No newline at end of file