feat: add github issue template

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,17 @@
+blank_issues_enabled: false
+contact_links:
+  - name: API issues
+    url: https://code.vikunja.io/api/issues
+    about: This is the frontend repo. Please open api-related bug reports and discussions in the api 0repo. Not sure if your issue is frontend or api? Ask in Matrix or the forum first.
+  - name: Forum
+    url: https://community.vikunja.io/
+    about: Feature Requests, Questions, configuration or deployment problems should be discussed in the forum.
+  - name: Security-related issues
+    url: https://vikunja.io/contact/#security
+    about: For security concerns, please send a mail to security@vikunja.io instead of opening a public issue.
+  - name: Chat on Matrix
+    url: https://matrix.to/#/#vikunja:matrix.org
+    about: Please ask any quick questions here.
+  - name: Translations
+    url: https://crowdin.com/project/vikunja
+    about: Any problems or requests for new languages about translations should be handled in crowdin.