Add ISSUE_TEMPLATE

Author: marijnvanwezel

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report 🐛
+about: If something isn't working as expected.
+---
+
+# Bug report
+
+<!-- Before reporting an issue please check that you are using the latest version of php-cypher-dsl! -->
+
+<!-- Please describe your problem here. -->
+
+### Code snippet that reproduces the problem
+
+<!-- Try to reproduce the issue you are facing using your favorite editor and paste the misbehaving code here -->
+
+### Expected output
+
+<!-- Was the Cypher query invalid or incorrect? Was something allowed even though it shouldn't be, or vice versa? -->

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+  - name: Support question
+    url: https://github.com/neo4j-php/php-cypher-dsl/discussions/new
+    about: Please open a new discussion instead. Thank you.

.github/ISSUE_TEMPLATE/missing_feature_request.md

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+---
+name: Missing feature request 🚀
+about: Some feature from Cypher has not been implemented
+---
+
+# Feature request
+
+<!-- Please provide a clear description of what is missing, preferably with a link to either openCypher or Neo4j. -->