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### What this PR does / why we need it? Add issue templates. Most of templates in this PR are from vllm-project/vllm: https://github.com/vllm-project/vllm/tree/main/.github/ISSUE_TEMPLATE ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? Test on my local repo by setting default branch to ISSUE_TEMPLATE: https://github.com/Yikun/vllm-ascend/issues https://github.com/Yikun/vllm-ascend/issues/new/choose Closes: https://github.com/vllm-project/vllm-ascend/issues/48 --------- Signed-off-by: Yikun Jiang <yikunkero@gmail.com>