Create bug_report.yaml and feature_request.yaml (#29)

## Summary
Create bug_report.yaml and feature_request.yaml

.github/ISSUE_TEMPLATE/bug_report.yaml

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+name: 🐛 Bug Report
+description: Create a report to help us reproduce and fix the bug
+
+body:
+- type: markdown
+  attributes:
+    value: >
+      #### Before submitting a bug, please make sure the issue hasn't been already addressed by searching through [the existing and past issues](https://github.com/triton-lang/triton/issues).
+- type: textarea
+  attributes:
+    label: 🐛 Describe the bug
+    description: |
+      Please provide a clear and concise description of what the bug is.
+    placeholder: |
+      A clear and concise description of what the bug is.
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Reproduce
+    description: |
+      If applicable, add a minimal example so that we can reproduce the error by running the code. 
+      The snippet needs to be as succinct (minimal) as possible, so please take time to trim down any irrelevant code to help us debug efficiently. 
+      We are going to copy-paste your code and we expect to get the same result as you did: avoid any external data, and include the relevant imports, etc. 
+      If the code is too long (hopefully, it isn't), feel free to put it in a public gist and link it in the issue: https://gist.github.com.
+      Please also paste or describe the results you observe instead of the expected results. 
+      If you observe an error, please paste the error message including the **full** traceback of the exception.
+  validations:
+    required: false
+
+- type: textarea
+  attributes:
+    label: Versions
+    description: |
+      Please provide triton, torch, hardware, and other necessary versions to reproduce the bug.
+  validations:
+    required: true
+
+- type: markdown
+  attributes:
+    value: >
+      Thanks for contributing 🎉!

.github/ISSUE_TEMPLATE/feature_request.yaml

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+name: 🚀 Feature request
+description: Submit a proposal/request for a new Triton feature
+
+body:
+- type: textarea
+  attributes:
+    label: 🚀 The feature, motivation and pitch
+    description: >
+      A clear and concise description of the feature proposal. Please outline the motivation for the proposal. Is your feature request related to a specific problem? e.g., *"I'm working on X and would like Y to be possible"*. If this is related to another GitHub issue, please link here too.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Alternatives
+    description: >
+      A description of any alternative solutions or features you've considered, if any.
+- type: textarea
+  attributes:
+    label: Additional context
+    description: >
+      Add any other context or screenshots about the feature request.
+- type: markdown
+  attributes:
+    value: >
+      Thanks for contributing 🎉!