Add issue templates (#35)

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

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+# Copyright 2025 Enactic, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Bug Report
+description: File a bug report.
+type: Bug
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the problem you got
+      description: It's better that you provide information as much as possible.
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/2-feature-request.yml

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+# Copyright 2025 Enactic, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Feature Request
+description: Request a feature.
+type: Feature
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the feature you want
+      description: It's better that you also provide your use case.
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/config.yml

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+# Copyright 2025 Enactic, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+blank_issues_enabled: false
+contact_links:
+  - name: Discord
+    url: https://discord.gg/FsZaZ4z3We
+    about: Please ask and answer questions here.
+  - name: GitHub Discussions
+    url: https://github.com/enactic/openarm_ros2/discussions
+    about: If you prefer GitHub Discussions to Discord, you can use GitHub Discussions too.