add issue templates.

Signed-off-by: Tomoya.Fujita <Tomoya.Fujita@sony.com>

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: File a bug report.
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: "**Required Info:**"
+  - type: checkboxes
+    attributes:
+      label: Is there an existing issue for this?
+      description: Please search to see if an issue already exists for the bug you encountered.
+      options:
+      - label: I have searched the existing issues
+        required: true
+  - type: textarea
+    id: regression
+    attributes:
+      label: Regression
+      description: Is the reported bug a regression? If so, what is the last version of ROS where it still worked fine?
+  - type: input
+    id: os
+    attributes:
+      label: "Operating System:"
+      description: |
+        Please try to be specific.
+        For Linux, please use the command `uname -a` from a terminal and copy paste its output here.
+        For Windows, open a terminal (Win key + R and type `cmd`), type the command `ver` and press enter.
+        Then copy paste the output here.
+    validations:
+      required: true
+  - type: input
+    id: version
+    attributes:
+      label: "ROS version or commit hash:"
+      description: |
+        **Examples:**  *humble*, *iron*, *jazzy*, ...
+    validations:
+      required: true
+  - type: input
+    id: rmw
+    attributes:
+      label: "RMW implementation:"
+      description: |
+        **Examples:** *rmw_fastrtps_cpp*, *rmw_connextdds*, *rmw_cyclonedds_cpp*, ...
+        You can check the ROS Middleware (RMW) implementation with the command: `ros2 doctor --report`
+        Find the line starting with `middleware name` in the report.
+    validations:
+      required: true
+  - type: input
+    id: clientlib
+    attributes:
+      label: "Client library (if applicable):"
+      description: |
+        **Examples:** *rclcpp*, *rclpy*, ...
+        Client libraries are the APIs that allow users to implement their ROS 2 code.
+    validations:
+      required: false
+  - type: textarea
+    id: doctor
+    attributes:
+      label: "'ros2 doctor --report' output"
+      description: |
+        It can help us knowing the details of your ROS environment.
+        Please use the command `ros2 doctor --report` and copy paste its output here.
+      render: Formatted
+    validations:
+      required: false
+  - type: textarea
+    id: repro
+    attributes:
+      label: "Steps to reproduce issue"
+      description: |
+        How do you trigger this bug? Please walk us through it step by step.
+        Include all the commands you ran in the exact order you ran them so that anyone can reproduce the bug.
+      placeholder: |
+        1.
+        2.
+        3.
+        ...
+    validations:
+      required: true
+  - type: textarea
+    id:  expected
+    attributes:
+      label: "Expected behavior"
+    validations:
+      required: true
+  - type: textarea
+    id: actual
+    attributes:
+      label: "Actual behavior"
+    validations:
+      required: true
+  - type: textarea
+    id: addinfo
+    attributes:
+      label: "Additional information"
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Robotics Stack Exchange
+    url: https://robotics.stackexchange.com/
+    about: Please ask and answer questions here.
+  - name: Documentation for Active ROS Distributions
+    url: https://docs.ros.org/
+    about: Please check our documentation here.
+  - name: ROS Discourse
+    url: https://discourse.ros.org/
+    about: Discussion on ROS and ROS-related things.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: File a feature request.
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: "Thanks for taking the time to fill out this feature request form!"
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: |
+        Description in a few sentences what the feature consists of and what problem it will solve.
+    validations:
+      required: true
+  - type: textarea
+    id: motivation
+    attributes:
+      label: Motivation
+      description: |
+        Description what you are trying to solve, what is the problem to address with this Feature Request.
+    validations:
+      required: true
+  - type: textarea
+    id: implementation
+    attributes:
+      label: Design / Implementation Considerations
+    validations:
+      required: false
+      description: |
+        Relevant information on how the feature could be implemented and pros and cons of the different solutions.
+  - type: textarea
+    id: information
+    attributes:
+      label: Additional Information
+    validations:
+      required: false
+      description: |
+        If you have more details information, please describe here.