feat: add GitHub files in .github directory

.github/CODEOWNERS

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+# Code owners file.
+# This file controls who is tagged for review for any given pull request.
+#
+# For syntax help see:
+# https://help.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners#codeowners-syntax
+
+*   @a2aproject/google

.github/ISSUE_TEMPLATE/bug-report.yml

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+---
+name: 🐞 Bug Report
+description: File a bug report
+title: "[Bug]: "
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for stopping by to let us know something could be better!
+        Private Feedback? Please use this [Google form](https://goo.gle/a2a-feedback)
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: What happened?
+      description:
+        Also tell us what you expected to happen and how to reproduce the
+        issue.
+      placeholder: Tell us what you see!
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant log output
+      description:
+        Please copy and paste any relevant log output. This will be automatically
+        formatted into code, so no need for backticks.
+      render: shell

.github/ISSUE_TEMPLATE/feature-request.yml

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+---
+name: 💡 Feature Request
+description: Suggest an idea for this repository
+title: "[Feat]: "
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for stopping by to let us know something could be better!
+        Private Feedback? Please use this [Google form](https://goo.gle/a2a-feedback)
+  - type: textarea
+    id: problem
+    attributes:
+      label: Is your feature request related to a problem? Please describe.
+      description: A clear and concise description of what the problem is.
+      placeholder: Ex. I'm always frustrated when [...]
+  - type: textarea
+    id: describe
+    attributes:
+      label: Describe the solution you'd like
+      description: A clear and concise description of what you want to happen.
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Describe alternatives you've considered
+      description:
+        A clear and concise description of any alternative solutions or
+        features you've considered.
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description:
+        Add any other context or screenshots about the feature request
+        here.

.github/conventional-commit-lint.yaml

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+enabled: true
+always_check_pr_title: true