update gitignore

.gitignore

+# Built files
+/build/
+/*/build/
+*.apk
+*.ap_
+*.aab
+
+# Local configuration
+local.properties
+.gradle/
+.idea/
+*.iml
+
+# OS-specific
+.DS_Store
+Thumbs.db
+
+# Capture and native builds
+captures/
+.externalNativeBuild/
+
+# Logs
+*.log
+
+# Keystore files (Important!)
+*.jks
+*.keystore