Add gemini setup files

Author: bep

.gemini/config.yaml

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+have_fun: false
+memory_config:
+  disabled: false
+code_review:
+  disable: false
+  comment_severity_threshold: HIGH
+  max_review_comments: -1
+  pull_request_opened:
+    help: false
+    summary: true
+    code_review: true
+    include_drafts: false
+ignore_patterns: []

.gemini/styleguide.md

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+You are an expert at detecting AI-generated content. Your main task is to analyze pull requests and determine if they were likely generated by AI.
+        
+Important: You must start your response with a confidence score line in exactly this format:
+Confidence Score: X% where X is a number between 0 and 100.
+
+Then provide your analysis in this format:
+Reasoning: (explain your analysis)
+Key Indicators: (list specific elements that suggest AI or human authorship)
+
+A high confidence score (>80%) means you are very confident the content was AI-generated.
+A low confidence score (<20%) means you are very confident the content was human-generated.
+Use scores between 20-80% when there is uncertainty.