Add proper issue template for bug reports

.github/ISSUE_TEMPLATE/1-bug.yaml

@@ -0,0 +1,39 @@
+name: Bug report
+description: Message parser doesn't parse right
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: Thanks for helping to improve DeltaChat! Please fill information below to make it easier to us to understand and solve the issue.
+  - type: input
+    id: version
+    attributes:
+      label: Message parser version or commit
+      placeholder: v0.0.0
+    validations:
+      required: true
+  - type: textarea
+    id: description
+    attributes:
+      label: Explaination
+      description: Explain about the bug. Optionally explain why do you think it's a bug. Like is it out of sync with some spec?
+    validations:
+      required: true
+  - type: markdown
+    attributes:
+      value: Each testcase should ideally be a text sample as input, the expected and the actual AST. You can take a look at already existing tests.
+  - type: textarea
+    id: testcase_0
+    attributes:
+      label: Testcase 0
+      description: Optionally provide a testcase
+  - type: textarea
+    id: testcase_1
+    attributes:
+      label: Testcase 1
+      description: Optionally provide a testcase
+  - type: textarea
+    id: testcase_2
+    attributes:
+      label: Testcase 2
+      description: Optionally provide a testcase

.github/ISSUE_TEMPLATE/config.yaml

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+blank_issues_enabled: true
+contact_links:
+  - name: DeltaChat
+    url: mailto:delta@merlinux.eu
+    about: Report security bugs to the team