added templates and enhanced readme (#307)

Co-authored-by: Justin Lee <justinai@fb.com>

.github/ISSUE_TEMPLATE/bug.yml

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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/meta-llama/llama-stack/issues).
+
+  - type: textarea
+    id: system-info
+    attributes:
+      label: System Info
+      description: |
+        Please share your system info with us. You can use the following command to capture your environment information
+        python -m "torch.utils.collect_env"
+
+      placeholder: |
+        PyTorch version, CUDA version, GPU type, #num of GPUs...
+    validations:
+      required: true
+
+  - type: checkboxes
+    id: information-scripts-examples
+    attributes:
+      label: Information
+      description: 'The problem arises when using:'
+      options:
+        - label: "The official example scripts"
+        - label: "My own modified scripts"
+
+  - type: textarea
+    id: bug-description
+    attributes:
+      label: 🐛 Describe the bug
+      description: |
+        Please provide a clear and concise description of what the bug is.
+
+        Please also paste or describe the results you observe instead of the expected results.
+      placeholder: |
+        A clear and concise description of what the bug is.
+
+        ```llama stack
+        # Command that you used for running the examples
+        ```
+        Description of the results
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Error logs
+      description: |
+       If you observe an error, please paste the error message including the **full** traceback of the exception. It may be relevant to wrap error messages in ```` ```triple quotes blocks``` ````.
+
+      placeholder: |
+        ```
+        The error message you got, with the full traceback.
+        ```
+
+    validations:
+      required: true
+
+
+  - type: textarea
+    id: expected-behavior
+    validations:
+      required: true
+    attributes:
+      label: Expected behavior
+      description: "A clear and concise description of what you would expect to happen."
+
+  - type: markdown
+    attributes:
+      value: >
+        Thanks for contributing 🎉!

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: 🚀 Feature request
+description: Submit a proposal/request for a new llama-stack feature
+
+body:
+- type: textarea
+  id: feature-pitch
+  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
+  id: alternatives
+  attributes:
+    label: Alternatives
+    description: >
+      A description of any alternative solutions or features you've considered, if any.
+
+- type: textarea
+  id: additional-context
+  attributes:
+    label: Additional context
+    description: >
+      Add any other context or screenshots about the feature request.
+
+- type: markdown
+  attributes:
+    value: >
+      Thanks for contributing 🎉!

.github/PULL_REQUEST_TEMPLATE.md

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+# What does this PR do?
+
+Closes # (issue)
+
+## Feature/Issue validation/testing/test plan
+
+Please describe the tests that you ran to verify your changes and relevant result summary. Provide instructions so it can be reproduced.
+Please also list any relevant details for your test configuration or test plan.
+
+- [ ] Test A
+Logs for Test A
+
+- [ ] Test B
+Logs for Test B
+
+
+## Sources
+
+Please link relevant resources if necessary.
+
+
+## Before submitting
+- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
+- [ ] Did you read the [contributor guideline](https://github.com/meta-llama/llama-stack/blob/main/CONTRIBUTING.md),
+      Pull Request section?
+- [ ] Was this discussed/approved via a Github issue? Please add a link
+      to it if that's the case.
+- [ ] Did you make sure to update the documentation with your changes?
+- [ ] Did you write any new necessary tests?
+
+Thanks for contributing 🎉!