feat: add github issue template

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -0,0 +1,58 @@
+name: Bug Report
+description: Found something you weren't expecting? Report it here!
+labels: kind/bug
+body:
+  - type: markdown
+    attributes:
+      value: |
+        NOTE: If your issue is a security concern, please send an email to security@vikunja.io instead of opening a public issue.
+  - type: markdown
+    attributes:
+      value: |
+        Please fill out this issue template to report a bug.
+        
+        1. If you want to propose a new feature, please open a discussion thread in the forum: https://community.vikunja.io
+        2. Please ask questions or configuration/deploy problems on our [Matrix Room](https://matrix.to/#/#vikunja:matrix.org) or forum (https://community.vikunja.io).
+        3. Make sure you are using the latest release and
+           take a moment to check that your issue hasn't been reported before.
+        4. Please give all relevant information below for bug reports, because
+           incomplete details will be handled as an invalid report and closed.
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: |
+        Please provide a description of your issue here, with a URL if you were able to reproduce the issue (see below).
+  - type: input
+    id: frontend-version
+    attributes:
+      label: Vikunja Frontend Version
+      description: Vikunja frontend version (or commit reference) of your instance
+    validations:
+      required: true
+  - type: input
+    id: api-version
+    attributes:
+      label: Vikunja API Version
+      description: Vikunja API version (or commit reference) of your instance
+    validations:
+      required: true
+  - type: input
+    id: browser-version
+    attributes:
+      label: Browser and version
+      description: If your issue is related to a frontend problem, please provide the browser and version you used to reproduce it.
+  - type: dropdown
+    id: can-reproduce
+    attributes:
+      label: Can you reproduce the bug on the Vikunja demo site?
+      options:
+        - "Yes"
+        - "No"
+    validations:
+      required: true
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots
+      description: If this issue involves the Web Interface, please provide one or more screenshots

.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.