Add Gemini configuration (#276)

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Co-authored-by: yefubao <fbye@baai.ac.cn>

Author: zihugithub

.gemini/config.yml

@@ -0,0 +1,8 @@
+# Mainly adopted from https://github.com/vllm-project/vllm/blob/main/.gemini/config.yaml. Below is the original copyright:
+# https://developers.google.com/gemini-code-assist/docs/customize-gemini-behavior-github
+have_fun: false  # Just review the code
+code_review:
+  comment_severity_threshold: HIGH  # Reduce quantity of comments
+  max_review_comments: -1 # Maximum number of review comments allowed; -1 indicates no limit
+  pull_request_opened:
+    summary: true  # Summarize the PR in a separate comment