[A/FFI] FFI sample

ffi_2_18/CHANGELOG.md

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+## 1.0.0
+
+- Initial version.

ffi_2_18/README.md

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+A sample command-line application with an entrypoint in `bin/`, library code
+in `lib/`, and example unit test in `test/`.
+
+### For creating the app
+- dart create ffi_2_18
+
+### For generating bindings
+- dart run ffigen --config timezone_config.yaml
+- dart run ffigen --config calendar_config.yaml
+- dart run ffigen --config url_cache_config.yaml
+
+
+### For testing the app
+- dart run bin/timezones.dart
+- dart run bin/audio.dart test.mp3
+- dart run bin/url_cache.dart
+- dart run bin/calendar.dart
+
+
+### For running the tests
+- dart test test/ffi_2_18_test.dart

ffi_2_18/analysis_options.yaml

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+# This file configures the static analysis results for your project (errors,
+# warnings, and lints).
+#
+# This enables the 'recommended' set of lints from `package:lints`.
+# This set helps identify many issues that may lead to problems when running
+# or consuming Dart code, and enforces writing Dart using a single, idiomatic
+# style and format.
+#
+# If you want a smaller set of lints you can change this to specify
+# 'package:lints/core.yaml'. These are just the most critical lints
+# (the recommended set includes the core lints).
+# The core lints are also what is used by pub.dev for scoring packages.
+
+include: package:lints/recommended.yaml
+
+# Uncomment the following section to specify additional rules.
+
+# linter:
+#   rules:
+#     - camel_case_types
+
+analyzer:
+  exclude:
+    - timezone_bindings.dart
+    - avf_audio_bindings.dart
+
+# For more information about the core and recommended set of lints, see
+# https://dart.dev/go/core-lints
+
+# For additional information about configuring this file, see
+# https://dart.dev/guides/language/analysis-options