add delete class and delete triple issue templates, part of snikproje…

…ct/graph#430

.github/ISSUE_TEMPLATE/deleteclass.yml

@@ -0,0 +1,16 @@
+name: Delete Class
+description: Permanently delete a class
+labels: ["deleteclass"]
+assignees:
+  - KonradHoeffner
+body:
+  - type: input
+    id: class
+    attributes:
+      label: Class
+    validations:
+      required: true
+  - type: textarea
+    id: sparql
+    attributes:
+      label: SPARQL query

.github/ISSUE_TEMPLATE/deleteedge.yml

@@ -0,0 +1,28 @@
+name: Delete Triple
+description: Permanently delete a triple (edge)
+labels: ["deletetriple"]
+assignees:
+  - KonradHoeffner
+body:
+  - type: input
+    id: subject
+    attributes:
+      label: Subject Class
+    validations:
+      required: true
+  - type: input
+    id: predicate
+    attributes:
+      label: Predicate
+    validations:
+      required: true
+  - type: input
+    id: object
+    attributes:
+      label: Object Class
+    validations:
+      required: true
+  - type: textarea
+    id: sparql
+    attributes:
+      label: SPARQL query