chore: add templates for issue&pr (#348)

.github/ISSUE_TEMPLATE/1-bug-report.yml

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+name: Bug report
+description: Create a report to help us improve
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for reporting an issue.
+
+        This issue tracker is for bugs and issues found within packege.
+
+        Please fill in as much of the following form as you're able.
+  - type: input
+    attributes:
+      label: Package version
+  - type: input
+    attributes:
+      label: Node version
+      description: |
+        Output of `node -v`.
+  - type: input
+    attributes:
+      label: Platform
+  - type: textarea
+    attributes:
+      label: What steps will reproduce the bug?
+      description: >
+        Enter details about your bug, preferably a simple code snippet that can
+        be run using without installing third-party dependencies
+        or downloading code from the internet.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: What is the expected behavior?
+      description: If possible please provide screenshots or textual output.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: What do you see instead?
+      description: If possible please provide screenshots or textual output.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Additional information
+      description: Tell us anything else you think we should know.

.github/ISSUE_TEMPLATE/2-feature_request.yml

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+name: Feature request
+description: Suggest an idea for this project
+labels: [feature request]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for suggesting an idea to make Diplodoc better.
+
+        Please fill in as much of the following form as you're able.
+  - type: textarea
+    attributes:
+      label: What is the problem this feature will solve?
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: What is the feature you are proposing to solve the problem?
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: What alternatives have you considered?

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Комьюнити чат (RU)
+    url: https://t.me/diplodoc_ru
+    about: Спросить у сообщества

.github/pull_request_template.md

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+<!--
+Thank you for submitting a Pull Request, before submitting, please read commit message formatting guidelines at https://www.conventionalcommits.org/en/v1.0.0/
+
+For code changes:
+1. Include tests for any bug fixes or new features.
+2. Update documentation if relevant.
+3. Ensure that the code is up-to-date with the `master` branch.
+4. Include a description of the proposed changes and how to test them.
+
+For Russian speaking contributors:
+Перед отправкой PR-a, пожалуйста, прочтите гайды для разработчиков платформы Diplodoc : https://diplodoc.com/docs/ru/dev/
+#xxxx" -->
+
+## Description
+
+<!-- Please include a summary of the changes. If it is feasible, it is worth attaching a screenshot or video of the changes. -->
+
+Related issue: #(issue number)
+
+<!-- If this is a bug fix, make sure your description includes "fixes #xxxx", or "closes #xxxx" -->