chore: create a template for our new operators

.github/ISSUE_TEMPLATE/new_operator.md

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+---
+name: New Operator
+about: Organise the support of a new operator or notion in the framework.
+labels: feature
+title: Support of **please-fill** in Concrete Framework
+---
+
+## Umbrella
+
+This issue is about the support of **please-fill**, which is a new operator or notion that we plan to have in the framework.
+
+This is subdivided in different subtasks (please click on the right of the list items to create subtasks):
+- [ ] Tracing of **please-fill**
+- [ ] Evaluating **please-fill**
+- [ ] Lowering **please-fill** and compilation
+- [ ] Correctness of execution of **please-fill**
+
+Also, some more work on our side (please click on the right of the list items to create subtasks):
+- [ ] Benchmark of **please-fill**
+- [ ] Tutorial of **please-fill** (if needed)
+
+In parallel, the issue to the compiler team (please click on the right of the list items to create subtasks):
+- [ ] Feature request from ConcreteML: **please-fill**
+