Create core-class-template.md

.github/ISSUE_TEMPLATE/core-class-template.md

@@ -0,0 +1,32 @@
+---
+name: Core Class Template
+about: Template used for new core classes in the Graaf library.
+title: "[CORE]"
+labels: enhancement
+assignees: ''
+
+---
+
+# [CLASS_NAME]
+A short description of what the class does and it's common use cases.
+
+## Syntax
+An initial idea for the (public) interface of the new class is as follows:<br>
+_(note that this is not set in store and merely serves as a starting point)_
+
+```c++
+class my_class {
+  public:
+    //...
+}
+```
+
+This class should live in the `graaf` namespace under `include/graaflib/`.
+
+## Definition of Done
+This issue is done when:
+
+- [ ] The new class is implemented
+- [ ] The new class has a javadoc-style comment for the entire class and for the public methods
+- [ ] Appropriate tests are added under `test/graaflib/algorithm`
+  - [ ] A test coverage of at least 95% is reached