Contribute a Gemini Code Assist config (#865)

Author: devoncarew

.gemini/config.yaml

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+# A configuration files for the Gemini Code Assist bot.
+#
+# https://developers.google.com/gemini-code-assist/docs/customize-gemini-behavior-github.
+
+# No poems please.
+have_fun: false
+
+code_review:
+  # Options here are LOW, MEDIUM, HIGH, and CRITICAL. The default is MEDIUM.
+  comment_severity_threshold: MEDIUM
+
+  # Configure the behavior for PR opened events.
+  pull_request_opened:
+    # Keep the default of no help message comments when pull requests are opened.
+    help: false
+    # This is noisy; disable.
+    summary: false
+    # Keep this on for now.
+    code_review: true

.gemini/styleguide.md

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+# The dart-lang Dart style guide
+
+## Introduction
+
+This style guide outlines the coding conventions for Dart code contributed to
+dart-lang repositories. All Dart code should follow the Effective Dart style
+guide (https://dart.dev/effective-dart/style).
+
+## Contribution Guidelines
+
+- larger or significant changes should be discussed in an issue before creating
+  a PR
+- contributions to our repos should follow the Dart style guide and use 'dart
+  format'
+- most changes should add an entry to the changelog and may need to rev the
+  pubspec package version
+- changes to packages require corresponding tests