docs: add issue templates (#71)

Resolves #65

Signed-off-by: Shiwei Zhang <[email protected]>

.github/ISSUE_TEMPLATE/bug-report.yaml

@@ -0,0 +1,59 @@
+# Copyright The ORAS Authors.
+# 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
+labels: [bug, triage]
+body:
+  - type: markdown
+    id: preface
+    attributes:
+      value: Thank you for reporting bugs to the ORAS .NET library!
+  - type: textarea
+    id: environment
+    validations:
+      required: true
+    attributes:
+      label: What happened in your code base? 
+  - type: textarea
+    id: expect
+    attributes:
+      label: What did you expect to happen?
+  - type: textarea
+    id: reproduce
+    validations:
+      required: true
+    attributes:
+      label: How can we reproduce it?
+      description: Please provide related code as minimally and precisely as possible.
+  - type: textarea
+    id: version
+    validations:
+      required: true
+    attributes:
+      label: What is the version or commit of the ORAS .NET library?
+  - type: input
+    id: env
+    validations:
+      required: true
+    attributes:
+      label: What are your OS and Runtime environments?
+      description: "e.g. Ubuntu 22.04 and .NET 8.0"
+  - type: checkboxes
+    id: idea
+    attributes:
+      label: Are you willing to submit PRs to fix it?
+      description: "This is absolutely not required, but we are happy to guide you in the contribution process
+        especially when you already have a good proposal or understanding of how to implement it. Join us at https://slack.cncf.io/ and choose #oras-dotnet channel."
+      options:
+        - label: Yes, I am willing to fix it.

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,14 @@
+# Copyright The ORAS Authors.
+# 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: true

.github/ISSUE_TEMPLATE/feature-request.yaml

@@ -0,0 +1,46 @@
+# Copyright The ORAS Authors.
+# 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: File a feature request
+labels: [enhancement, triage]
+body:
+  - type: markdown
+    id: preface
+    attributes:
+      value: Thank you for submitting new features for the ORAS .NET library
+  - type: input
+    id: version
+    attributes:
+      label: What is the version or commit of the ORAS .NET library?
+  - type: textarea
+    id: description
+    attributes:
+      label: What would you like to be added?
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: Why is this needed for the ORAS .NET library?
+      description: Please describe your user story or scenario.
+    validations:
+      required: true
+  - type: checkboxes
+    id: idea
+    attributes:
+      label: Are you willing to submit PRs to contribute to this feature?
+      description: "This is absolutely not required, but we are happy to guide you in the contribution process
+        especially when you already have a good proposal or understanding of how to implement it. Join us at https://slack.cncf.io/ and choose #oras-dotnet channel."
+      options:
+        - label: Yes, I am willing to implement it.