Add yml issue templates.

Author: kristijanhusak

.github/ISSUE_TEMPLATE/bug_report.md

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+name: Bug report
+description: Create a report to help us improve orgmode
+labels: bug
+body:
+  - type: textarea
+    validations:
+      required: true
+    attributes:
+      label: Describe the bug
+      description: A clear description of what the bug is.
+  - type: textarea
+    validations:
+      required: true
+    attributes:
+      label: Steps to reproduce
+      description: |
+        Steps to reproduce the problem.
+      placeholder: |
+        For example:
+        1. Go to '...'
+        2. Click on '....'
+        3. Scroll down to '....'
+        4. See error
+  - type: textarea
+    validations:
+      required: true
+    attributes:
+      label: Expected behavior
+      description: A brief description of what should happen.
+  - type: textarea
+    attributes:
+      label: Emacs functionality
+      description: If this functionality exists in Emacs Orgmode, explain how it works there.
+  - type: textarea
+    attributes:
+      label: Screenshots and recordings
+      description: |
+        If applicable, add screenshots to help explain your problem. You can also record an asciinema session: https://asciinema.org/
+  - type: input
+    validations:
+      required: true
+    attributes:
+      label: OS / Distro
+      placeholder: e.g. Windows 10, Ubuntu 20.04, Arch Linux, macOS 10.15...
+  - type: input
+    validations:
+      required: true
+    attributes:
+      label: Neovim version/commit
+      description: Run `nvim --version` to check.
+      placeholder: e.g. 0.5
+  - type: textarea
+    attributes:
+      label: Additional context
+      description: Add any other context about the problem here.

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Feature request
+description: Suggest an idea for this project
+labels: enhancement
+body:
+  - type: markdown
+    attributes:
+      value: |
+        **NOTE**: If provided feature request is a separate plugin in emacs orgmode, and not part of the emacs orgmode core functionality,
+        request will be most likely rejected. Anything that's a separate plugin in emacs orgmode should be a separate plugin in here.
+        Any suggestions how to improve infrastructure for building plugins should be posted here: https://github.com/kristijanhusak/orgmode.nvim/issues/26
+  - type: dropdown
+    validations:
+      required: true
+    attributes:
+      label: Does this feature exist in Emacs orgmode core?
+      options:
+        - 'Yes'
+        - 'No'
+        - 'N/A'
+  - type: textarea
+    attributes:
+      label: Orgmode link
+      description: If answer to first question is "Yes", please provide the link to the orgmode manual or any documentation related to the feature,
+  - type: textarea
+    attributes:
+      label: Feature value
+      description: If answer to first question is "No", elaborate on how this feature is valuable and what problem does it solve.,
+  - type: textarea
+    attributes:
+      label: Additional context
+      description: Add any other context about the problem here. This can be themes, plugins, custom settings...