Add issue templates

Author: swallez

.github/ISSUE_TEMPLATE/bug.yml

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+name: Bug
+description: "Report a bug."
+labels: []
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Github is reserved for bug reports and feature requests. If you have a question or
+        an unconfirmed bug, please visit the [forums](https://discuss.elastic.co/tag/language-clients).
+
+        Please fill in the following details to help us reproduce the bug:
+
+  - type: input
+    id: client_version
+    attributes:
+      label: Java API client version
+      description: The version of Java API client
+    validations:
+      required: true
+
+  - type: input
+    id: es_version
+    attributes:
+      label: Elasticsearch Version
+      description: The version of Elasticsearch you are using
+    validations:
+      required: true
+
+  - type: input
+    id: java_version
+    attributes:
+      label: Java version
+      description: The Java version of your application that uses the Java API client
+      value: _bundled_
+    validations:
+      required: true
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem description
+      description: |
+        A description of the problem including expected versus actual behavior. Providing JSON snippets of the expected behavior from the
+        Kibana dev tools console will help diagnosing the issue.
+    validations:
+      required: true
+

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Question
+    url: https://discuss.elastic.co/tag/language-clients
+    about: Ask (and answer) questions here.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Request a new feature
+labels: []
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Please first search existing issues for the feature you are requesting. It may already exist, even as a closed issue.
+        If it exists, please add a comment: along with subcribing you to the issue, this will help us prioritize features.
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: |
+        Please give us as much context as possible about the feature.