docs: add AI contribution guidelines and .geminiignore (#878)

Author: kikoso

.geminiignore

@@ -0,0 +1,40 @@
+# Ignore build and generated directories
+build/
+**/build/
+.gradle/
+.idea/
+.kotlin/
+.vscode/
+
+# Ignore outputs
+*.apk
+*.ap_
+*.aab
+*.dex
+*.class
+
+# Ignore large media assets (images, fonts, etc) unless specifically required
+**/*.png
+**/*.jpg
+**/*.jpeg
+**/*.gif
+**/*.webp
+**/*.svg
+**/*.mp4
+**/*.mp3
+**/*.wav
+**/*.ttf
+**/*.woff
+**/*.woff2
+**/*.otf
+
+# Ignore temporary and cache files
+tmp/
+**/tmp/
+*.log
+*.tmp
+*.bak
+*.swp
+*~.nib
+local.properties
+.DS_Store

CONTRIBUTING.md

@@ -26,6 +26,12 @@ information on using pull requests.
 
 Reviews will undergo strict enforcement of the [Jetpack Compose API guidelines](https://github.com/androidx/androidx/blob/androidx-main/compose/docs/compose-api-guidelines.md).
 
+## Using AI to Contribute
+
+This repository provides an official Gemini Skill to help AI agents navigate and contribute to the project effectively. If you are using the `gemini-cli` or a compatible AI tool, you can invoke the skill located in `.gemini/skills/android-maps-compose` to learn how to integrate or modify the Maps Compose components. 
+
+Additionally, the `.geminiignore` file prevents AI tools from consuming large or irrelevant files to preserve context limits.
+
 ## Community Guidelines
 
 This project follows