[General] Add issue templates

Signed-off-by: Seth Howell <sethh@nvidia.com>

Author: seth-howell

.github/ISSUE_TEMPLATE/ISSUE.yaml

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+name: NVSHMEM issue or bug
+description: Report an issue or failure when running NVSHMEM code
+title: "[Issue]: "
+labels: ["triage"]
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reaching out! Before reporting a new issue, please feel free to search for the behavior in the existing issues. If you found an issue which is already closed or you are unsure, open a new issue and reference the old one from it.
+        You can also check out the [FAQ section](https://docs.nvidia.com/nvshmem/api/faq.html) in our documentation.
+        
+        ---
+        
+        To ensure we can assist you quickly and accurately, we often need the following information:
+  - type: dropdown
+    id: type
+    attributes:
+      label: How is this issue impacting you?
+      description: What best describes your issue?
+      options:
+        - Lower performance than expected
+        - Application crash
+        - Data corruption
+        - Application hang
+    validations:
+      required: true
+
+  - type: textarea
+    id: log
+    attributes:
+      label: Share Your Debug Logs
+      description: |
+
+        The logs are a great tool to pin down issues. Please set these environment variables before the run.
+        * `NVSHMEM_DEBUG=INFO` and `NVSHMEM_DEBUG_SUBSYS=ALL` to produce full debug information.
+        Please configure your launch script to capture one log per rank.
+
+  - type: textarea
+    id: repro
+    attributes:
+      label: Steps to Reproduce the Issue
+      description: |
+        * **Minimal Steps**: Please provide a simple way to recreate the issue (see [Minimal Bug Reports](https://matthewrocklin.com/minimal-bug-reports) for inspiration).
+        * **Environment Details**: Include software versions and relevant settings.
+        * **Intermittency**: Is this a sporadic issue? If so, how often does it occur?
+        * **Previous Success**: Did this work with an older NVSHMEM version?
+
+        The easier we can reproduce on our side the more likely we are to be able to solve it in a timely manner.
+
+  - type: input
+    id: nvshmem_version
+    attributes:
+      label: NVSHMEM Version
+      description: |
+        NVSHMEM reports its version string in the debug logs.
+      placeholder: "e.g. 3.4.5-0+cuda12.8"
+    validations:
+      required: true
+
+  - type: textarea
+    id: platform
+    attributes:
+      label: Your platform details
+      description: |
+        * **GPU & Network**: Share your architecture and topology (e.g., from `nvidia-smi`, `nvidia-smi topo -m`, `ibstatus`).
+        * **Environment**: Bare-metal, containers, or cloud?
+        * **Scalability**: Does this issue occur with a specific number of ranks/nodes?
+
+  - type: textarea
+    id: issue-description
+    attributes:
+      label: Error Message & Behavior
+      description: |
+        * **First Error**: What was the initial Error message in your logs?
+        * **Expected vs. Actual**: Briefly describe the anticipated behavior versus what you're seeing.

.github/ISSUE_TEMPLATE/QUESTION.yaml

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+name: NVSHMEM question
+description: Ask the NVSHMEM team a question
+title: "[Question]: "
+labels: ["question"]
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reaching out! To solve your problem, feel free to check out the [user guide](https://docs.nvidia.com/nvshmem/api/using.html), in particular the FAQ section, and the [release notes](https://docs.nvidia.com/nvshmem/release-notes-install-guide/release-notes/index.html).
+        ---
+  - type: textarea
+    id: question
+    attributes:
+      label: Question

.github/ISSUE_TEMPLATE/RFE.yaml

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+name: NVSHMEM request for enhancement
+description: Request for enhancement
+title: "[RFE]: "
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+
+        Thanks for your feedback! Before reporting a new RFE you could quickly check if this already exists in our [existing requests](https://github.com/NVIDIA/nvshmem/issues?q=is%3Aissue%20state%3Aopen%20label%3Aenhancement).
+        
+        ---
+  - type: textarea
+    id: rfe-description
+    attributes:
+      label: Please provide the below details to ensure we understand your needs
+      description: |
+        * What is the goal of this request?
+        * Who will benefit from this feature?
+        * Is this request for a specific GPU architecture or network infrastructure?
+        * How will this feature improve current workflows or processes?
+        * What is the priority level of this request?

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false