Create a default issue template

Author: Cito

.github/ISSUE_TEMPLATE/graphql-core-issue-template.md

@@ -0,0 +1,30 @@
+---
+name: GraphQL-core issue template
+about: Template for all GraphQL-core issues
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+# Questions regarding how to use GraphQL
+
+We want to keep signal strong in the GitHub issue tracker – to make sure that it remains the best place to track bugs and features that affect development.
+
+If you have a question on how to use GraphQL, please [post it to Stack Overflow](https://stackoverflow.com/questions/ask?tags=graphql) with the tag [#graphql](https://stackoverflow.com/questions/tagged/graphql).
+
+Please do not post general questions directly as GitHub issues. They may sit for weeks unanswered, or may be spontaneously closed without answer.
+
+# Reporting issues with GraphQL-core 3
+
+Before filing a new issue, make sure an issue for your problem doesn't already exist and that this is not an issue that should be filed against a different repository (see below).
+
+The best way to get a bug fixed is to provide a _pull request_ with a simplified failing test case (or better yet, include a fix).
+
+# Reporting issues with GraphQL-core 2
+
+Please use the issue tracker of the [legacy repository](https://github.com/graphql-python/graphql-core-legacy) for issues with legacy versions of GraphQL-core.
+
+# Feature requests
+
+GraphQL-core is a Python port or the [GraphQL.js](https://github.com/graphql/graphql-js) reference implementation of the [GraphQL specification](https://github.com/graphql/graphql-spec). To discuss new features which are not Python specific, please open an issue against the GraphQL.js project. To discuss features that fundamentally change the way GraphQL works, open an issue against the specification.